Property And Equipment (Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Property, Plant And Equipment [Line Items]
Property and equipment, gross	$ 2,073,750	$ 2,058,987
Less accumulated depreciation and amortization	1,091,597	1,051,018
Property and equipment, net	982,153	1,007,969
Land
Property, Plant And Equipment [Line Items]
Property and equipment, gross	19,895	19,071
Buildings and improvements
Property, Plant And Equipment [Line Items]
Property and equipment, gross	71,005	69,629
Well service units and equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	488,532	483,644
Fluid services equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	277,585	277,902
Brine and fresh water stations
Property, Plant And Equipment [Line Items]
Property and equipment, gross	13,764	14,175
Frac/test tanks
Property, Plant And Equipment [Line Items]
Property and equipment, gross	367,730	355,912
Pumping equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	336,660	343,379
Construction equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	15,680	15,764
Contract drilling equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	111,484	110,510
Disposal facilities
Property, Plant And Equipment [Line Items]
Property and equipment, gross	158,877	157,519
Light vehicles
Property, Plant And Equipment [Line Items]
Property and equipment, gross	69,880	70,414
Rental equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	104,278	102,471
Aircraft
Property, Plant And Equipment [Line Items]
Property and equipment, gross	713	857
Software
Property, Plant And Equipment [Line Items]
Property and equipment, gross	21,617	21,416
Other
Property, Plant And Equipment [Line Items]
Property and equipment, gross	$ 16,050	$ 16,324