(14) Segment Data

The Company’s operations are aggregated into two reportable business segments as follows:

Marine Transportation — Provides marine transportation principally by United States flag vessels of liquid cargoes throughout the United States inland waterway system, along all three United States coasts, in Alaska and Hawaii and, to a lesser extent, in United States coastal transportation of dry-bulk cargoes. The principal products transported include petrochemicals, black oil, refined petroleum products and agricultural chemicals.

Diesel Engine Services — Provides after-market services for medium-speed and high-speed diesel engines, reduction gears and ancillary products for marine and power generation applications, distributes and services high-speed diesel engines, transmissions and pumps, and manufactures and remanufactures oilfield service equipment, including pressure pumping units, for the land-based oilfield service and oil and gas operator and producer markets.

The Company’s two reportable business segments are managed separately based on fundamental differences in their operations. The Company’s accounting policies for the business segments are the same as those described in Note 1, Summary of Significant Accounting Policies. The Company evaluates the performance of its segments based on the contributions to operating income of the respective segments, and before income taxes, interest, gains or losses on disposition of assets, other nonoperating income, noncontrolling interests, accounting changes, and nonrecurring items. Intersegment revenues, based on market-based pricing, of the diesel engine services segment from the marine transportation segment of $24,672,000, $26,203,000 and $25,769,000 in 2016, 2015 and 2014, respectively, as well as the related intersegment profit of $2,467,000, $2,620,000 and $2,577,000 in 2016, 2015 and 2014, respectively, have been eliminated from the tables below.

The following table sets forth by reportable segment the revenues, profit or loss, total assets, depreciation and amortization, and capital expenditures attributable to the principal activities of the Company for the years ended December 31, 2016, 2015 and 2014 (in thousands):

	2016			2015			2014
Revenues:
Marine transportation	$	1,471,893		$	1,663,090		$	1,770,684
Diesel engine services		298,780			484,442			795,634
	$	1,770,673		$	2,147,532		$	2,566,318
Segment profit (loss):
Marine transportation	$	257,102		$	374,842		$	429,864
Diesel engine services		3,186			18,921			60,063
Other		(32,542	)		(32,051	)		(35,537	)
	$	227,746		$	361,712		$	454,390
Total assets:
Marine transportation	$	3,622,348		$	3,451,553		$	3,317,696
Diesel engine services		628,290			637,549			736,129
Other		52,861			63,179			83,789
	$	4,303,499		$	4,152,281		$	4,137,614
Depreciation and amortization:
Marine transportation	$	184,291		$	175,798		$	154,019
Diesel engine services		12,833			12,498			11,463
Other		3,793			3,944			3,830
	$	200,917		$	192,240		$	169,312
Capital expenditures:
Marine transportation	$	217,423		$	311,862		$	340,315
Diesel engine services		5,915			28,907			7,486
Other		7,728			4,706			7,343
	$	231,066		$	345,475		$	355,144

The following table presents the details of “Other” segment profit (loss) for the years ended December 31, 2016, 2015 and 2014 (in thousands):

	2016			2015			2014
General corporate expenses	$	(14,966	)	$	(14,773	)	$	(14,896	)
Interest expense		(17,690	)		(18,738	)		(21,461	)
Gain (loss) on disposition of assets		(127	)		1,672			781
Other income (expense)		241			(212	)		39
	$	(32,542	)	$	(32,051	)	$	(35,537	)

The following table presents the details of “Other” total assets as of December 31, 2016, 2015 and 2014 (in thousands):

	2016		2015		2014
General corporate assets	$	50,239	$	61,089	$	81,250
Investment in affiliates		2,622		2,090		2,539
	$	52,861	$	63,179	$	83,789