C. Smith
Analyst · Macquarie
Thank you, David, and good morning. In the 2015 third quarter, Marine Transportation segment revenue declined 7% and operating income declined 16% as compared with the 2014 third quarter. The decline in revenue in the third quarter as compared to the prior year was primarily due to a 38% decline in the average cost of marine diesel fuel as well as some impact from inland contracts renewed at lower rates throughout the year. The Marine Transportation segment operating margin was 22.4% compared with 25% for the 2014 third quarter.
The inland sector contributed approximately 70% of Marine Transportation revenue, with the coastal sector contributing 30%. Inland marine weather was seasonally normal, but operating conditions were challenging due to high water early in the quarter and scheduled log closures along the Gulf Intracoastal Waterway, which contributed to a 40% year-over-year increase in delay days and a decline in ton mile. Despite these challenges and the pricing pressures that Joe and David mentioned, the inland sector generated an operating margin in the mid to high 20% range for the quarter.
The third quarter results for inland marine also reflected the anticipated year-over-year negative impact of $0.03 per share for higher pension expense, reflecting actuarial changes to mortality tables and a lower discount rate.
In the coastal sector, we experienced heavy shipyard activity in the third quarter as anticipated and mentioned on our July conference call. With the 38% decline in fuel prices and a number of vessels in the shipyard, revenue in the coastal sector declined both year-over-year and sequentially. Pricing on contracts renewing during the quarter continued to improve, as David mentioned.
Additionally, we shortened the depreciable lives on some -- of some assets in our coastal fleet which were coming up for shipyard in 2016 and the estimated cost of extending their lives did not make sense. This resulted in a combined $3.5 million increase in depreciation expense and dry dock amortization for the quarter. This change, plus higher maintenance expense during the quarter, in addition to ongoing impacts from higher wages, depreciation and deferred dry dock amortization, led to a year-over-year decline in the coastal sector operating margin, which was in the low double-digits. Without the additional depreciation and deferred dry dock amortization expense mentioned above, the margin would have been in the mid-teens.
During the 2015 first 9 months, we took delivery of 35 new tank barges, and when combined with the 6 pressure barges purchased in the first quarter, increased capacity by approximately 560,000 barrels. The number of barges we retired, including return charter barges, totaled 25, removing approximately 370,000 barrels of capacity. We also transferred one coastal 30,000-barrel tank barge that was working inland back into the coastal fleet. The net result was an addition of 15 tank barges to our inland tank barge fleet and approximately 160,000 barrels of additional capacity.
In the 2015 fourth quarter, we expect to take delivery of 3 30,000-barrel inland tank barges with a total capacity of approximately 90,000 barrels. Combining these additions with our current plan of 7 retirements in the fourth quarter will result in an approximate capacity at year-end of 17.9 million barrels, a reduction of 70,000 barrels from our current capacity.
In the coastwise transportation sector, construction of our 4 coastal articulated tank barge and tugboat units continue to progress with the first unit, a 185,000-barrel 10,000-horsepower ATB, expected to be delivered and in service later this year. Our second new offshore vessel, also a 185,000-barrel ATB, is likely to deliver in mid-2016. We continue to expect delivery of a third and fourth vessel, both 155,000-barrel ATBs, in late 2016 and mid-2017, respectively.
In our press release last night, we also announced shipyard contracts to build 2 4,900-horsepower coastal tugboats and a new 35,000-barrel offshore chemical tank barge. The new offshore chemical barge will enter service under long-term contract with an existing customer upon delivery, which is expected in early 2017.
Moving on to our Diesel Engine Services segment. Revenue for the 2015 third quarter declined 51% and operating income decreased 72% compared with the 2014 third quarter. The segment's operating margin was 4.9% compared with 8.6% for the 2014 third quarter.
The Marine and Power Generation operations contributed approximately 40% of the Diesel Engine Services revenue in the third quarter, with an operating margin in the low to mid-double-digits. The operating margin was impacted by approximately $700,000 of severance expense incurred in the third quarter as we continue to address costs across our whole organization as appropriate.
Our land-based operations contributed approximately 60% of the Diesel Engine Services segment's revenue in the third quarter, with breakeven operating income.
During the 2015 third quarter, Kirby signed an asset purchase agreement to sell United Engines Compression. The transaction is expected to close in the 2015 fourth quarter. And based on the structure of the agreement and current levels of working capital, the sales price is expected to be approximately equal to the book value of the net asset sold.
On the corporate side of things, our cash flow remained strong during the quarter, which helped fund our marine construction plans and $63 million of treasury stock purchased during the quarter. Subsequent to the quarter, we purchased an additional 292,000 shares for $18.9 million. Any future decision to repurchase stock will be based on a number of factors including the stock price, our long-term earnings and cash flow forecasts as well as alternative opportunities available to deploy capital including acquisitions.
We have raised our 2015 capital spending guidance slightly to a range of $320 million to $330 million, including approximately $70 million for the construction of 38 inland tank barges and 3 inland towboats expected to be delivered in 2015 and approximately $100 million in progress payments on the construction of the new coastal equipment. The balance of $150 million to $160 million is primarily for capital upgrades and improvements to existing inland and coastal marine equipment and facilities as well as Diesel Engine Services facilities.
Total debt as of September 30 stood at $810 million, a $2 million increase from June 30 of this year and a $93 million increase from our total debt of $717 million at December 31, 2014. The increased debt since year-end 2014 was primarily due to the acquisition of the 6 pressure barges in the 2015 first quarter and treasury stock purchases during the first 9 months of the year. As of today, our debt stands at $819 million. Our debt-to-cap ratio at September 30, 2015 was 26.4% compared with 24% as of December 31, 2014.
I'll now turn the call back over to Dave.