Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of property, plant and equipment at cost net of accumulated depreciation

December 31,	2012			2011
(in thousands)
Land	$	17,420		$	17,403
Buildings and leasehold improvements		111,986			94,152
Operating equipment		1,155,600			990,186
Computer software		20,581			18,662
Furniture and fixtures		7,232			5,679
Vehicles		357,913			306,716
Construction in progress		9,829			9,828
Gross property, plant and equipment		1,680,561			1,442,626
Less: accumulated depreciation		(924,235	)		(767,266	)
Net property, plant and equipment	$	756,326		$	675,360

- Definition

Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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