Segment Information (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014 segments	Dec. 31, 2013	Jun. 30, 2014 Drilling Services Segment [Member] drilling_rigs	Jun. 30, 2014 Production Services Segment [Member] wireline_tubing_units well_service_rigs coiled_tubing_units	Jun. 30, 2013 Production Services Segment [Member] coiled_tubing_units	Jun. 30, 2014 Production Services Segment [Member] Fishing and Rental Tools and Equipment [Member]	Jun. 30, 2014 Production Services Segment [Member] 550 Horsepower [Member] well_service_rigs	Jun. 30, 2014 Production Services Segment [Member] 600 Horsepower [Member] well_service_rigs	Jun. 30, 2014 Colombia [Member] Drilling Services Segment [Member] drilling_rigs	Jun. 30, 2014 Colombia [Member] Drilling Services Segment [Member] Drilling Rigs [Member] drilling_rigs	Dec. 31, 2013 Colombia [Member] Drilling Services Segment [Member] Drilling Rigs [Member] drilling_rigs	Jun. 30, 2014 Colombia [Member] Drilling Services Segment [Member] Assets Leased From Others [Member] drilling_rigs	Dec. 31, 2013 Colombia [Member] Drilling Services Segment [Member] Assets Leased From Others [Member] drilling_rigs
Segment Reporting Information [Line Items]
Drilling Rigs			62						8	5	5	3	3
Number of Reportable Segments	2
Well Servicing Rigs				112			102	10
Wireline Units				121
Coiled Tubing Units				14	13
Property, Plant and Equipment, Gross	$ 1,778,653	$ 1,724,124				$ 17,400