(15) 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 products, 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'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 sales for 2012, 2011 and 2010 were not significant.

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, 2012, 2011 and 2010 (in thousands):

	2012			2011			2010
Revenues:
Marine transportation	$	1,408,893		$	1,194,607		$	915,046
Diesel engine services		703,765			655,810			194,511
	$	2,112,658		$	1,850,417		$	1,109,557
Segment profit (loss):
Marine transportation	$	311,755		$	262,193		$	192,758
Diesel engine services		66,386			68,105			20,553
Other		(37,615	)		(35,551	)		(23,671	)
	$	340,526		$	294,747		$	189,640
Total assets:
Marine transportation	$	2,951,723		$	2,307,821		$	1,383,252
Diesel engine services		647,986			608,886			185,824
Other		53,419			43,704			225,861
	$	3,653,128		$	2,960,411		$	1,794,937
Depreciation and amortization:
Marine transportation	$	129,857		$	111,292		$	88,710
Diesel engine services		12,030			11,801			4,055
Other		3,260			2,936			2,531
	$	145,147		$	126,029		$	95,296
Capital expenditures:
Marine transportation	$	274,351		$	218,777		$	132,744
Diesel engine services		20,477			5,576			920
Other		17,339			1,885			3,177
	$	312,167		$	226,238		$	136,841

The following table presents the details of "Other" segment profit (loss) for the years ended December 31, 2012, 2011 and 2010 (in thousands):

	2012			2011			2010
General corporate expenses	$	(13,294	)	$	(17,915	)	$	(13,189	)
Interest expense		(24,385	)		(17,902	)		(10,960	)
Loss on disposition of assets		(14	)		(40	)		(78	)
Other income		78			306			556
	$	(37,615	)	$	(35,551	)	$	(23,671	)

The following table presents the details of "Other" total assets as of December 31, 2012, 2011 and 2010 (in thousands):

	2012		2011		2010
General corporate assets	$	51,611	$	40,022	$	222,525
Investment in affiliates		1,808		3,682		3,336
	$	53,419	$	43,704	$	225,861