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Operator
Good morning, ladies and gentlemen, and welcome to the Martin Midstream Partners First Quarter 2018 Earnings Conference Call. (Operator Instructions) As a reminder, this conference call is being recorded. I would now like to turn the conference over to your host, Mr. Bob Bondurant, Chief Financial Officer. Sir, you may begin.
Robert D. Bondurant - Executive VP, CFO, Principal Accounting Officer & Director of Martin Midstream GP LLC
Okay. Thank you, Bridget. And to let everyone know who is on the call today, we have Joe McCreery, our VP of Finance and Head of Investor Relations; and Scott Southard, our VP of Commercial Development.
Before we get started with the financial and operational results for the first quarter, I need to make this disclaimer. Certain statements made during this conference call may be forward-looking statements relating to financial forecasts, future performance and our ability to make distributions to unit holders.
We report our financial results in accordance with generally accepted accounting principles, any certain non-GAAP financial measures within the meanings of SEC Regulation G, such as distributable cash flow and earnings before interest, tax, depreciation or amortization or EBITDA and we also use adjusted EBITDA. We use these measures because we believe it provides users of our financial information with meaningful comparisons between current results and prior reported results, and it can be a meaningful measure of the partnership's cash available to pay distributions.
We also included in our press release issued yesterday a reconciliation of EBITDA, adjusted EBITDA, distributable cash flow and quarterly adjusted EBITDA guidance to the most comparable GAAP financial measure. Our earnings press release is available at our website, martinmidstream.com.
Now I'd like to discuss our first quarter performance, compared to the fourth quarter and also discuss our first quarter performance compared to our guidance. For the first quarter, we had adjusted EBITDA of $44.7 million compared to $49.3 million in the fourth quarter of 2017. Our distributable cash flow for the first quarter was $26.7 million, which provided a quarterly distribution coverage of 1.36x. For the first quarter, our adjusted EBITDA of $44.7 million compared favorably to guidance of $43.9 million.
Now by segment, I would like to discuss our first quarter operating performance compared against the fourth quarter and discuss our operating performance compared to our segment guidance for the first quarter.
In our Natural Gas Services segment, our first quarter adjusted EBITDA was $23.2 million compared to $29.7 million in the fourth quarter. Included in adjusted EBITDA was $1.5 million in distributions from West Texas LPG in the first quarter compared to $1.2 million in distributions from West Texas LPG in the fourth quarter.
Now the significant portion of the decrease in cash flow between quarters for our Natural Gas Services segment was primarily from our Butane Logistics business. During the first quarter, our selling season winds down toward the first part of March as refineries end their demand for butane for blending into their gasoline pool. As a result, demand fell 20% between the fourth quarter and the first quarter.
Currently, our butane business is beginning to rebuild inventory through the second and third quarter before butane sales significantly begin again in late September.
Now compared to our first quarter guidance, our Natural Gas services segment exceeded forecast by $1.3 million. This improvement of our forecast was primarily a result of our wholesale propane business as our market area experienced extremely cold weather in January that provided stronger volumes in margins than were originally forecasted.
Moving to our Terminaling and Storage segment, our first quarter adjusted EBITDA was $13.7 million compared to $12.3 million in the fourth quarter, an increase of $1.4 million. The increase is primarily due to improved performance in our specialty terminals group as we had experienced large hurricane repair cost in the fourth quarter of 2017.
Now compared to first quarter guidance, our Terminaling and Storage segment missed the guidance by $0.6 million, as we had forecasted $14.3 million of adjusted EBITDA. While we exceeded guidance by $0.6 million at our naphthenic lubricant refinery due to reduced operating expenses, we missed guidance by $0.7 million in our packaged lubricant business and $0.6 million in our shore-based terminal business.
Sales volume from our large lubricant distributors were below forecast, and offshore diesel volume throughput at our shore-based terminals was also below forecast. We believe distributor volume from our packaged lubricant business will improve in the second quarter, while our shore-based terminal sales volumes may continue to be challenged as the Gulf of Mexico rig count continues to be weak relative to prior quarters.
However, the Gulf rig count has improved in April relative to the first quarter. We also continued to work at reducing our fixed cost structure in our shore-based terminal business.
In our Sulfur Services segment, our first quarter adjusted EBITDA was $9.8 million compared to $8.7 million in the fourth quarter. Our fertilizer business had an increase in adjusted EBITDA of $2.6 million between quarters, while our pure sulfur byproduct business adjusted EBITDA decreased to $1.5 million.
Our fertilizer business experienced its usual seasonal improvement as we move into the first quarter as sales volume increased 50% between quarters. Offsetting this was a decline in our pure sulfur side of the business as sales volume declined 46% primarily due to anticipated first quarter refinery turnaround from our sulfur suppliers.
Now compared to first quarter guidance, our Sulfur Services segment missed forecast by $0.2 million. This decline was all from our pure sulfur side of the business as our fertilizer group achieved guidance.
In our Marine Transportation segment, we had no significant variances as we had adjusted EBITDA in the first quarter of $2.1 million compared to $2.2 million in the fourth quarter. When compared to first quarter guidance, our Marine Transportation segment exceeded forecast by $0.6 million.
We had several inland vessels experience regulatory dry dockings in the first quarter. However, the duration of time in the shipyard was less than expected, helping us to beat our cash flow guidance. Our unallocated SG&A was $4.1 million for the quarter, which was slightly higher than guidance.
Now I would like to turn the call over to Joe to discuss our balance sheet and capital spending.
Joe McCreery - Head of IR for Martin Midstream GP LLC and VP of Finance for Martin Midstream GP LLC
Thanks, Bob. Let's start with the normal walk-through of the debt components of our balance sheet, tying in our bank ratios at quarter end and then discuss our capital spending during the first quarter and our planned full year 2018 capital spending as it pertains to our leverage ratios.
On March 31, 2018, the partnership's balance sheet reflected total long-term funded debt of approximately $795 million, a reduction of approximately $18 million from the year-end 2017 level. Our balance sheet funded debt is shown before on amortized debt issuance and unamortized issuance premiums as actual funded debt outstanding was $802 million.
Reconciling to this amount, at quarter end, our revolving credit facility balance was $428 million, and the notional amount of our senior unsecured notes was $374 million. Thus, our total available liquidity on March 31 was $236 million based on our $664 million revolving credit facility.
For the quarter ended March 31, 2018, our bank compliant leverage ratios defined as senior secured indebtedness to adjusted EBITDA and total indebtedness to adjusted EBITDA were 2.69x and 5.04x, respectively. During the quarter, we reduced working capital by approximately $25 million through the continued sale of our NGL inventory.
Commencing with our second quarter results, we'll begin using our recently adopted working capital sublimit to reduce leverage from our revolving credit facility. This sublimit will exclude certain debt attributed to the seasonal NGL inventory build where the partnership has either forward sold or hedged inventory from our total debt to EBITDA ratio. We anticipate the carve-out will have a meaningful impact on our leveraged ratio during the second and third quarters when our revolver balances are elevated from our seasonal NGL inventory buildup.
Our bank-compliant interest coverage ratio, as defined by adjusted EBITDA to consolidated interest expense, was 3.31x. Looking at the balance sheet, total debt to total capitalization on March 31 was 73.2%, unchanged from December 31, 2017. In all, at quarter end March 31, 2018, the partnership was in full compliance with all banking covenants, financial or otherwise.
The partnership did not raise capital during the first quarter but did amend its revolving credit facility to allow for increased investment in the West Texas LPG pipeline and provide flexibility around natural gas liquids inventory, as previously highlighted.
Now let me focus on capitalized spending during the quarter and how that projects for the rest of 2018. First, with respect to growth capital expenditures, we spent approximately $8 million during the first quarter, which includes approximately $2 million on the West Texas LPG pipeline expansion.
Due to timing on certain projects, this is approximately $15 million less than forecasted during the quarter. That said, specific to the pipeline project, we have encountered heavy spending in the early part of the second quarter and believe that total spending at midyear 2018 will be in line with the scheduled forecast.
Recall from our guidance presentation in February, our full year growth capital expenditures are anticipated to be $50 million, of which nearly $40 million is attributed to the West Texas LPG expansion.
Switching to maintenance capital expenditures. From our guidance, we anticipated maintenance capital expenditures of approximately $29 million during 2018. Recall that our forecasted maintenance spending this year is elevated by approximately $11 million due to nondiscretionary regulatory mandated project cost at our Smackover Refinery and the U.S. Coast Guard required dry docking of certain marine transportation assets.
In the first quarter, we spent approximately $6 million, which was $3 million below our expected maintenance Capex level, again, the difference being primarily timing associated with our maintenance plan. However, we may look to revise our full year maintenance capital spending guidance and revise distributable cash flow after the second quarter is complete. Currently, we are tracking to spend approximately $4 million less than originally forecasted, which, of course, would have a favorable impact on our full-year distribution coverage ratio.
Looking ahead, based primarily on our growth capital spending forecast and the seasonal ramp-up in working capital of our butane business, we expect our leverage ratio will increase by 30 to 40 basis points next quarter and settle in the 5.3x to 5.4x range before any adjustments from our working capital sublimit.
Bridget, this concludes our prepared remarks this morning. We would now like to open the lines for question-and-answer.
Operator
(Operator Instructions) Our first question comes from the line of Matt Schmid with Stephens.
Foster Matthews Schmid - Research Analyst
Looking at the quarter, the Natural Gas services segment continues to be strong. Obviously, you got that propane boost in the first quarter, but interruptible trend seemed like they should continue to be good throughout the year. Just maybe can I get a little detail about your thoughts about how that interruptible business should churn throughout the year and maybe its potential to outperform versus guidance.
Robert D. Bondurant - Executive VP, CFO, Principal Accounting Officer & Director of Martin Midstream GP LLC
Well, I will say this. In the first quarter, at our Cardinal Gas Storage, we did exceed internal forecast by about $0.5 million, slightly -- just slightly above that for that very reason. And we don't really see any change in the near term. So a lot of that activity was at our Monroe Gas storage facility, but there was also some activity in North Louisiana as well. So we feel, relative to guidance, that there could be some upside there.
Foster Matthews Schmid - Research Analyst
Okay, great. And moving to the West Texas LPG pipeline, is there any update there on any timing potentially of the rate resolution?
Scott A. Southard - VP of Commercial Development
This is Scott. So the hearing's examiner, if you recall, the [borough] commission remanded the case back to the hearing's examiner. The hearing has -- examiner has set the merits hearing for September 26 through 28. That's the schedule as we know it today.
Operator
Our next question is from Robert Balsamo with B. Riley FBR.
Robert Francis Balsamo - Senior VP & Analyst
First question, just, I guess, housekeeping. You mentioned on maintenance CapEx that they could spend a little bit less -- a little below forecast. Would that be pushing? Is that just timing issue now to push to -- to bump up 2019? Or is that just at the reduction in -- potential reduction in spend?
Joe McCreery - Head of IR for Martin Midstream GP LLC and VP of Finance for Martin Midstream GP LLC
Rob, this is Joe. So it's a combination of both really, from the standpoint of it, looks like similar projects are going to come in under budget, which is also a good thing. And second to that, some timing with respect to projects that didn't all make the scheduled completion for 2018 into '19. But as I mentioned, we're tracking $4 million less currently.
Robert Francis Balsamo - Senior VP & Analyst
Great. And then on the NGL assets that kind of came in a little below the guidance, I know in the past, you talked about the -- some weakness in East Texas. Could you talk a little bit about those assets? And is that something that will continue? Or is there any change expected to recover towards guidance levels?
Robert D. Bondurant - Executive VP, CFO, Principal Accounting Officer & Director of Martin Midstream GP LLC
Yes, that is our pipeline that runs from East Texas near our office here in Kilgore to Beaumont. And the truck volume that we feed into that, that goes to another large refinery in Beaumont has been very muted and continue to be muted (inaudible). However, there, we are exploring 2 options on that asset. Both have good viability and would improve our financial positions, both on the balance sheet side and on the EBITDA and DCF side. We won't be able to negotiate it right now. So we are finding and alternatives that will help improve our position.
Operator
And our next question comes from the line of Tom Murphy with Raymond James.
Thomas Murphy
With regards to the West Texas LPG capital spending, can you remind me where the plan was to be at midyear? Was that $35 million and $5 million spilling into 3Q?
Joe McCreery - Head of IR for Martin Midstream GP LLC and VP of Finance for Martin Midstream GP LLC
Yes, John. This is Joe. So essentially, we're projecting to spend about $25 million of the $40 million in the first 2 quarters.
Thomas Murphy
Okay. And then the rest is all in 3Q or should some of that fall into 4Q?
Joe McCreery - Head of IR for Martin Midstream GP LLC and VP of Finance for Martin Midstream GP LLC
Some will fall into 4Q and maybe a smidge into the next year. But really, the $40 million that we guided to is a 2018 number.
Thomas Murphy
Okay, great. And then one more, if I could. Is there any update on the progress for asset sales?
Robert D. Bondurant - Executive VP, CFO, Principal Accounting Officer & Director of Martin Midstream GP LLC
Asset sales? Well, asset sales Chris(inaudible) no real progress. I would say we're in the same position where we were in the Q1. I will make one comment to add to Joe's comment on the Capex on West Texas LPG. We do believe new revenue will be coming online for us in the third quarter. That is still consistent.
Joe McCreery - Head of IR for Martin Midstream GP LLC and VP of Finance for Martin Midstream GP LLC
Like in the third quarter.
Robert D. Bondurant - Executive VP, CFO, Principal Accounting Officer & Director of Martin Midstream GP LLC
Correct.
Operator
Our next question is from Mike Gyure with Janney.
Michael Christopher Gyure - MD of Forensic Accounting and MLPs
Can you guys talk a little bit, I guess, about the trend you're seeing in the asphalt business maybe through the first quarter and maybe in -- early in the second quarter here?
Robert D. Bondurant - Executive VP, CFO, Principal Accounting Officer & Director of Martin Midstream GP LLC
Yes. So big picture trends are -- it's been a little slow start. I think weather has impacted activity on the volume side. Our company is involved in both the Texas, Louisiana markets and then also into the Tampa market. I will say the Florida market has been stronger than Texas and Louisiana. And we're not talking about this. I'm talking about our General Partner side where the volumes where they sell the volumes, but they do use our assets to throughput the volumes. So -- but the majority of all our assets at MMLP are the take-or-pay contracts, so that cash flow is going to continue no matter what the volume situation is. But we believe the State of Texas is still poised for growth. We think the spend really picks up in the back half of the summer. New dollars have been allocated from the State of Texas, and that increases significantly beginning about August, September. So we do believe the slowness in the Texas, Louisiana market is because the kick-offs are really not going to happen big until later in the summer.
Joe McCreery - Head of IR for Martin Midstream GP LLC and VP of Finance for Martin Midstream GP LLC
And Mike, this is Joe. Just to add, obviously, we're well positioned for that given the Hondo acquisition about a year ago, first quarter of 2017. So that asset is well positioned to capture the expansion in growth that Bob just alluded to.
Michael Christopher Gyure - MD of Forensic Accounting and MLPs
Great. And then maybe on the West Texas LPG spend of the $40 million. Are you guys still anticipating that's going to be financed primarily with debt or completely with debt?
Joe McCreery - Head of IR for Martin Midstream GP LLC and VP of Finance for Martin Midstream GP LLC
Yes. This is Joe again. That is correct. As you saw in the first quarter, we went to our banks and amended our revolving credit facility to allow for that growth CapEx spend, essentially widening, expanding the covenant cushion that we have for a 5-quarter period while that project is completed.
Operator
Our next question is from Patrick Wang with Baird.
Cheng Wang - Junior Analyst
Just back on the West Texas LPG rate case. With the window now effectively open until September, is there anything noteworthy from a competition evidence perspective that come up for the ROC's consideration?
Scott A. Southard - VP of Commercial Development
This is Scott. So there's nothing that significant. I mean, we continue to monitor some of the new competition out there. Recall that the remand provided for the consideration of additional relevant evidence, including market studies, and we are undertaking some of those activities to put additional evidence in the record.
Cheng Wang - Junior Analyst
Got it, all right. And then, so as you've gotten closer to this project and service date, has your thinking around still prefer net expansion side of it, has your thinking around economics changed at all?
Robert D. Bondurant - Executive VP, CFO, Principal Accounting Officer & Director of Martin Midstream GP LLC
No, it hasn't at this time.
Operator
And our last question is from Selman Akyol with Stifel.
Selman Akyol - MD of Equity Research
Just curious, from a high level in terms of the political front, are you seeing any changes at all for demand for fertilizer? Is it coming this season?
Robert D. Bondurant - Executive VP, CFO, Principal Accounting Officer & Director of Martin Midstream GP LLC
The buying of corn acreage plan, which is kind of our key metric that we follow is down slightly from last year. But we don't think it's going to be a significant impact to us on the volume side. There is a slight pick-up in competition in one of our market areas that could impact margins. But overall, there's nothing that we're seeing as of today that would impact our guidance number that we gave everybody.
Okay. So that was the last question. One comment that -- we did have a good start to 2018 as we're ahead of plan on both EBITDA and DCF. As Joe mentioned, we are going to have heavier growth CapEx spending anticipated in Q2 and Q3 as we look to complete our West Texas LPG project. And we do believe we have potential upward DCF guidance at midyear, which may improve our forecasted distributable coverage ratio. So things -- feel good, and we appreciate your coverage and support of the company. Thank you.
Operator
Ladies and gentlemen, this does conclude the program. You may now disconnect. Everyone, have a great day.