Property And Equipment (Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Property, Plant And Equipment [Line Items]
Property and equipment, gross	$ 1,823,578	$ 1,758,357
Less accumulated depreciation and amortization	871,359	814,591
Property and equipment, net	952,219	943,766
Land
Property, Plant And Equipment [Line Items]
Property and equipment, gross	20,764	16,338
Buildings And Improvements
Property, Plant And Equipment [Line Items]
Property and equipment, gross	58,808	53,831
Well Service Units And Equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	496,712	487,785
Fluid Services Equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	235,408	218,933
Brine And Fresh Water Stations
Property, Plant And Equipment [Line Items]
Property and equipment, gross	13,877	14,101
Frac/Test Tanks
Property, Plant And Equipment [Line Items]
Property and equipment, gross	275,474	274,311
Pressure Pumping Equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	289,636	277,529
Construction Equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	15,362	15,657
Contract Drilling Equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	104,542	105,992
Disposal Facilities
Property, Plant And Equipment [Line Items]
Property and equipment, gross	141,124	119,903
Vehicles
Property, Plant And Equipment [Line Items]
Property and equipment, gross	63,518	61,802
Rental Equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	68,623	65,047
Aircraft
Property, Plant And Equipment [Line Items]
Property and equipment, gross		4,151
Software
Property, Plant And Equipment [Line Items]
Property and equipment, gross	23,313	23,921
Other
Property, Plant And Equipment [Line Items]
Property and equipment, gross	$ 16,417	$ 19,054