Property And Equipment (Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,599,363	$ 1,539,275
Less accumulated depreciation and amortization	718,036	682,863
Property and equipment, net	881,327	856,412
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	12,325	11,314
Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	49,038	47,710
Well Service Units And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	472,127	447,743
Fluid Services Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	184,312	179,495
Brine And Fresh Water Stations [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,797	13,000
Frac/Test Tanks [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	257,085	246,816
Pressure Pumping Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	252,893	246,931
Construction Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	29,615	29,281
Contract Drilling Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	95,270	93,728
Disposal Facilities [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	80,019	78,632
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	56,875	54,238
Rental Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	51,683	46,851
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	23,820	23,595
Other [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 16,253	$ 15,690

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.

+ References+ Details

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.

+ References+ Details

- 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.

+ References+ Details