Property And Equipment (Schedule Of Property, Plant And Equipment Under Capital Lease) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	$ 213,778	$ 258,077
Less accumulated amortization	82,679	100,896
Property, plant and equipment under capital lease, net	131,099	157,181
Fluid services equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	129,459	143,014
Pumping equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	43,573	42,264
Light vehicles
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	33,424	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	541	883
Construction equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	$ 288	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