Segment Information (Schedule of Segment Reporting Information, Assets by Segment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011 segments	Dec. 31, 2010	Dec. 31, 2011 Fishing and Rental Tolls and Equipment [Member]	Feb. 10, 2012 Drilling Services Division [Member] South Texas [Member] drilling_rigs	Feb. 10, 2012 Drilling Services Division [Member] East Texas [Member] drilling_rigs	Feb. 10, 2012 Drilling Services Division [Member] North Dakota [Member] drilling_rigs	Feb. 10, 2012 Drilling Services Division [Member] Utah [Member] drilling_rigs	Feb. 10, 2012 Drilling Services Division [Member] Appalachia [Member] drilling_rigs	Feb. 10, 2012 Drilling Services Division [Member] Colombia [Member] drilling_rigs	Dec. 31, 2011 Production Services Division [Member] Fishing and Rental Tolls and Equipment [Member]	Feb. 10, 2012 Future Period Analysis [Member] Drilling Services Division [Member] drilling_rigs	Feb. 10, 2012 Future Period Analysis [Member] Drilling Services Division [Member] West Texas [Member] drilling_rigs	Feb. 10, 2012 Future Period Analysis [Member] Production Services Division [Member] well_service_rigs coiled_tubing_units wireline_tubing_units	Feb. 10, 2012 Future Period Analysis [Member] Production Services Division [Member] Five Hundred Fifty Horsepower [Member] well_service_rigs	Feb. 10, 2012 Future Period Analysis [Member] Production Services Division [Member] Six Hundred Horsepower [Member] well_service_rigs	Feb. 10, 2012 Future Period Analysis [Member] Production Services Division [Member] Four Hundred Horsepower [Member] well_service_rigs
Segment Reporting Information [Line Items]
Segment Reporting, Reportable Operating Segments	2
Drilling Rigs				15	5	9	4	5	8		64	18
Well Service Rigs													91	81	9	1
Wireline Units													109
Coiled Tubing Units													10
Property, Plant and Equipment, Gross	$ 1,336,926	$ 1,097,179	$ 15,063							$ 15,100