Property And Equipment (Schedule Of Property, Plant And Equipment Under Capital Lease) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	$ 221,054	$ 258,077
Less accumulated amortization	85,506	100,896
Property, plant and equipment under capital lease, net	135,548	157,181
Light vehicles
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	38,336	47,853
Contract drilling equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	6,493	6,142
Well service units and equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	753	883
Fluid services equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	137,759	143,014
Pumping equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	37,426	42,264
Construction equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	$ 287	730
Software
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross		17,120
Other
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross		$ 71