Property And Equipment (Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant And Equipment [Line Items]
Property and equipment, gross	$ 2,058,987	$ 1,869,006
Less accumulated depreciation and amortization	1,051,018	940,969
Property and equipment, net	1,007,969	928,037
Land
Property, Plant And Equipment [Line Items]
Property and equipment, gross	19,071	17,800
Buildings and improvements
Property, Plant And Equipment [Line Items]
Property and equipment, gross	69,629	65,702
Well service units and equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	483,644	498,846
Fluid services equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	277,902	258,371
Brine and fresh water stations
Property, Plant And Equipment [Line Items]
Property and equipment, gross	14,175	13,496
Frac/test tanks
Property, Plant And Equipment [Line Items]
Property and equipment, gross	355,912	275,603
Pumping equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	343,379	299,300
Construction equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	15,764	15,677
Contract drilling equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	110,510	104,958
Disposal facilities
Property, Plant And Equipment [Line Items]
Property and equipment, gross	157,519	143,459
Vehicles
Property, Plant And Equipment [Line Items]
Property and equipment, gross	70,414	64,942
Rental equipment
Property, Plant And Equipment [Line Items]
Property and equipment, gross	102,471	70,738
Aircraft
Property, Plant And Equipment [Line Items]
Property and equipment, gross	857
Software
Property, Plant And Equipment [Line Items]
Property and equipment, gross	21,416	23,360
Other
Property, Plant And Equipment [Line Items]
Property and equipment, gross	$ 16,324	$ 16,754