Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2012

Property and equipment consisted of the following at December 31, 2012 and 2011 (in thousands):


	2012			2011
Equipment	$	5,387,490		$	4,730,925
Oil and natural gas properties		156,834			131,812
Buildings		66,490			64,090
Land		10,413			11,467

		5,621,227			4,938,294
Less accumulated depreciation and depletion		(2,005,844	)		(1,771,028	)

Property and equipment, net	$	3,615,383		$	3,167,266

Summary of Depreciation, Depletion, Amortization and Impairment Expense related to Property and Equipment and Intangible Assets

Depreciation, depletion, amortization and impairment — The following table summarizes depreciation, depletion, amortization and impairment expense related to property and equipment and intangible assets for 2012, 2011 and 2010 (in thousands):


	2012		2011		2010
Depreciation and impairment expense	$	502,953	$	419,183	$	322,308
Amortization expense		4,110		4,110		1,027
Depletion expense		19,551		13,986		10,158

Total	$	526,614	$	437,279	$	333,493

- 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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