(7)	SEGMENT DATA

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

Marine Transportation — Marine transportation principally by United States flag vessels of liquid cargoes throughout the United States inland waterway system, along all three United States coasts, Alaska and Hawaii and, to a lesser extent, 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, and distributes and services high-speed diesel engines, transmissions, pumps and compression products, and manufactures and remanufactures oilfield service equipment, including pressure pumping units, for the land-based pressure pumping and oilfield service markets.

The Company’s two reportable business segments are managed separately based on fundamental differences in their operations. 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 sales for the three months ended March 31, 2015 and 2014 were not significant.

The following table sets forth the Company’s revenues and profit or loss by reportable segment for the three months ended March 31, 2015 and 2014 and total assets as of March 31, 2015 and December 31, 2014 (in thousands):

	Three months ended March 31,
	2015			2014
Revenues:
Marine transportation	$	419,905		$	435,771
Diesel engine services		167,768			153,475
	$	587,673		$	589,246
Segment profit (loss):
Marine transportation	$	96,269		$	97,551
Diesel engine services		8,843			12,772
Other		(7,210	)		(9,323	)
	$	97,902		$	101,000

	March 31, 2015		December 31, 2014
Total assets:
Marine transportation	$	3,386,629	$	3,317,696
Diesel engine services		713,903		736,129
Other		51,362		88,084
	$	4,151,894	$	4,141,909

The following table presents the details of “Other” segment loss for the three months ended March 31, 2015 and 2014 (in thousands):

	Three months ended March 31,
	2015			2014
General corporate expenses	$	(3,575	)	$	(3,520	)
Gain on disposition of assets		1,555			51
Interest expense		(5,250	)		(5,618	)
Other income (expense)		60			(236	)
	$	(7,210	)	$	(9,323	)

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

	March 31, 2015		December 31, 2014
General corporate assets	$	48,687	$	85,545
Investment in affiliates		2,675		2,539
	$	51,362	$	88,084