Property And Equipment (Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property, Plant And Equipment [Line Items]
Property and equipment, gross	$ 1,903,510	$ 1,869,006
Less accumulated depreciation and amortization	980,278	940,969
Property and equipment, net	923,232	928,037
Land
Property, Plant And Equipment [Line Items]
Property and equipment, gross	17,316	17,800
Buildings And Improvements
Property, Plant And Equipment [Line Items]
Property and equipment, gross	66,593	65,702
Well Service Units And Equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	467,651	498,846
Fluid Services Equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	257,566	258,371
Brine And Fresh Water Stations
Property, Plant And Equipment [Line Items]
Property and equipment, gross	15,007	13,496
Frac/Test Tanks
Property, Plant And Equipment [Line Items]
Property and equipment, gross	318,633	275,603
Pumping Equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	310,579	299,300
Construction Equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	15,908	15,677
Contract Drilling Equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	106,664	104,958
Disposal Facilities
Property, Plant And Equipment [Line Items]
Property and equipment, gross	149,365	143,459
Light Vehicles
Property, Plant And Equipment [Line Items]
Property and equipment, gross	64,879	64,942
Rental Equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	73,150	70,738
Software
Property, Plant And Equipment [Line Items]
Property and equipment, gross	21,010	23,360
Other
Property, Plant And Equipment [Line Items]
Property and equipment, gross	$ 19,189	$ 16,754