Property And Equipment (Schedule Of Property, Plant And Equipment Under Capital Lease) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	$ 202,494	$ 190,774
Less accumulated amortization	67,711	63,194
Property, plant and equipment under capital lease, net	134,783	127,580
Light Vehicles
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	35,365	31,180
Contract Drilling [Member]
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	4,223	4,223
Well Service Units And Equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	1,408	1,748
Fluid Services Equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	114,838	105,932
Pressure Pumping Equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	28,499	29,253
Construction Equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	942	974
Software
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	17,120	17,120
Other
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	$ 99	$ 344