Property And Equipment (Schedule Of Property, Plant And Equipment Under Capital Lease) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	$ 205,589	$ 213,778
Less accumulated amortization	85,363	82,679
Property, plant and equipment under capital lease, net	120,226	131,099
Fluid services equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	125,605	129,459
Pumping equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	42,440	43,573
Light vehicles
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	30,719	33,424
Contract drilling equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	5,840	6,493
Well service units and equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	605	541
Construction equipment
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	288	$ 288
Buildings and improvements
Property, Plant And Equipment [Line Items]
Property, plant and equipment under capital lease, gross	$ 92