Property And Equipment (Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,539,275	$ 1,192,258
Less accumulated depreciation and amortization	682,863	566,556
Property and equipment, net	856,412	625,702
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	11,314	5,361
Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	47,710	32,047
Well Service Units And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	447,743	416,015
Fluid Services Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	179,495	148,989
Brine And Fresh Water Stations [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,000	10,969
Frac/Test Tanks [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	246,816	151,379
Pressure Pumping Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	246,931	171,892
Construction Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	29,281	27,799
Contract Drilling Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	93,728	44,181
Disposal Facilities [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	78,632	66,388
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	54,238	39,844
Rental Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	46,851	43,502
Aircraft [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,251	4,251
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	23,595	22,296
Other [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 15,690	$ 7,345

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can 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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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. 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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