C. Smith
Analyst · Stephens
Thank you, David, and good morning. In the 2015 first quarter, Marine Transportation segment revenue declined 4% and operating income declined 1% as compared with the 2014 first quarter. The inland sector contributed approximately 70% of Marine Transportation revenue with the coastal sector contributing 30%.
Our inland sector generated an operating margin in the mid-20% range, and the coastal sector generated an operating margin in the high teens. Overall, the Marine Transportation segment's operating margin was 22.9% compared with 22.4% for the 2014 first quarter. The decline in Marine Transportation segment revenue in the first quarter as compared to the prior year was primarily due to a 34% decline in the average cost of marine diesel fuel, which is largely passed through to our customers, albeit with some lagging effect.
Following normal seasonal patterns, we typically experience difficult weather in the first quarter. Late in the 2015 first quarter, weather challenges were particularly acute with high winds and fog along the Gulf Coast and icing on the Illinois and Upper Ohio Rivers. Despite these challenges, inland marine delay days, while slightly above our 5-year average, were down 18% as compared to the 2014 first quarter, a quarter where we experienced more severe icing and high water conditions in the Midwest as well as high winds and fog along the Gulf Coast.
Also, the first quarter results did reflect the anticipated year-over-year negative impact of $0.04 per share for higher pension expense, reflecting actuarial changes to mortality tables and a lower discount rate. We noted in our January call, our 2015 results will be negatively impacted by an estimated year-over-year increase of $0.15 per share from pension expense and $0.24 per share from increased depreciation and amortization, the result of capital additions and capital upgrades in 2014 and expected capital additions in 2015.
David will discuss our second quarter and full year guidance in a minute, but let me comment on fuel. Our second quarter guidance reflects an estimated $0.03 to $0.05 per share temporary sequential impact from the decline in fuel price as compared to 1Q '15. Some of our contracts allow us to directly bill customers for the cost of fuel. In others, we have escalators which are designed to pass through the cost of fuel. Those escalators are most effective when fuel price changes are gradual. Diesel fuel prices have swung from a very high point to a very low point in a very short period of time and have recently increased some off of the lows. In this environment, our escalators are not perfect in passing through recent increases. We have seen this situation a few times in our history, and as prices stabilize, we should see the negative impact ultimately reverse.
During the 2015 first quarter, we took delivery of 21 new tank barges with a total capacity of approximately 310,000 barrels. We also purchased from a competitor 6 pressure barges which added approximately 100,000 barrels of capacity. We retired 6 inland tank barges, removing approximately 100,000 barrels of capacity. The net result was an addition of 21 inland tank barges to our fleet constituting a net increase of approximately 310,000 barrels. Of the 21 inland tank barges delivered, 16 were 10,000-barrel barges and 5 were 30,000-barrel barges.
For the remaining 9 months of 2015, we expect to take delivery of 14 additional 10,000-barrel inland tank barges and 4 additional 30,000-barrel inland tank barges. Including retirement, we expect to add net capacity of approximately 490,000 barrels over the course of the year, leading to year-end capacity of approximately 18.3 million barrels versus 17.8 million barrels at the end of 2014.
As I mentioned earlier, in March we purchased 6 16,000-barrel inland LPG pressure barges for $41.3 million from a carrier who has decided to exit the pressurized cargo transportation business.
In the coastwise transportation sector, construction of our 4 coastal articulated tank barge and tugboat units is proceeding as planned, with the first unit, a 185,000-barrel 10,000-horsepower ATB, expected to be delivered and in service in the 2015 fourth quarter. Our second new offshore vessel, also a 185,000-barrel ATB, is currently ahead of schedule and looks likely to deliver at the very end of this year or early next year. We continue to expect delivery of the third and fourth vessels, both 185,000-barrel ATBs, in late 2016 and mid-2017, respectively.
I also want to reiterate something that we've previously mentioned regarding the coastal fleet operating expenses. Deferred drydock expenses are drydock costs that are capitalized and amortized over the time between drydockings, generally a 30- to 60-month period. This expense ramps up as equipment obtained via acquisition goes into drydock until the entire acquired fleet goes through a full regulatory shipyard cycle under Kirby ownership. As such, our deferred drydock amortization in 2015 is expected to result in approximately $5 million of additional expense compared to 2014.
Moving on to our Diesel Engine Services business. Revenue for the 2015 first quarter increased 9% while operating income decreased 31% compared with the 2014 first quarter. The segment's operating margin was 5.3% compared with 8.3% for the 2014 first quarter. The marine and power generation operations contributed approximately 30% of the Diesel Engine Services revenue in the first quarter, with an operating margin in the low to mid-teens. Our land-based operations contributed approximately 70% of the Diesel Engine Services segment's revenue in the first quarter, with an operating margin in the low single digits. This operation incurred a pretax severance charge during the first quarter that totaled $1.2 million.
As David mentioned, we let go of approximately 40% of the manufacturing workforce during the quarter to better reflect our anticipated production schedule in this difficult market environment.
In March, Kirby completed the sale of a loss-producing land-based Diesel Engine Services product line to a strategic buyer for approximately $9.5 million. The sale resulted in a small pretax gain that roughly offset the severance expense I just mentioned. The product line was expected to have a slight negative, but not material, impact on operating income in 2015.
On the corporate side of things, our cash flow remained strong during the quarter, which helped to fund our marine equipment construction plan, the acquisition of the 6 pressure barges and $98 million of treasury stock purchased during the quarter. The stock purchases were a combination of the completion of the $100 million stock repurchase program we started in the 2014 fourth quarter and open market repurchases.
With respect to any further repurchases, we will continue to evaluate all available potential uses of capital. And as you know, at times, and for various reasons, we are precluded from being in the market. Any future decision to repurchase stock will be based on a number of factors, including such limitations, the stock price and our long-term earnings and cash flow forecast as well as the alternative opportunities available to deploy capital including acquisitions.
We have revised our 2015 capital spending guidance to a range of $315 million to $325 million including approximately $75 million for the construction of 39 inland tank barges and 3 inland towboats expected to be delivered in 2015 and approximately $95 million in progress payments on the construction of the new ATBs. The balance of $145 million to $155 million is primarily for capital upgrades and improvements to existing inland and coastal marine equipment and facilities as well as Diesel Engine Services facilities. The $15 million increase in the range was primarily due to timing of payments for the construction of the ATBs and offshore shipyards which were accelerated into 2015 from 2016 to accommodate customers' needs.
Total debt as of December 31 -- total debt as of March 31 was $819 million, a $102 million increase from our total debt of $717 million on December 31, 2014. The increased debt was primarily due to the acquisition of the 6 pressure barges and treasury stock purchases during the quarter. As of today, our debt stands at $809 million and our debt-to-cap ratio at March 31, 2015 was 26.9% compared with 24% as of December 31, 2014.
I'll now turn the call back over to David.