Segment Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2014 segments	Dec. 31, 2012 drilling_rigs	Feb. 01, 2015 drilling_rigs
Segment Reporting Information [Line Items]
Number of Reportable Segments	2
Colombia [Member] | Drilling Services Segment [Member] | Drilling Rigs [Member]
Segment Reporting Information [Line Items]
Drilling Rigs	5	5
Colombia [Member] | Drilling Services Segment [Member] | Assets Leased From Others [Member]
Segment Reporting Information [Line Items]
Drilling Rigs	3	3
Subsequent Event [Member] | Drilling Services Segment [Member]
Segment Reporting Information [Line Items]
Drilling Rigs			47
Subsequent Event [Member] | Production Services Segment [Member]
Segment Reporting Information [Line Items]
Well Service Rigs			117
Wireline Units			128
Coiled Tubing Units			17
Subsequent Event [Member] | Production Services Segment [Member] | 550 Horsepower [Member]
Segment Reporting Information [Line Items]
Well Service Rigs			107
Subsequent Event [Member] | Production Services Segment [Member] | 600 Horsepower [Member]
Segment Reporting Information [Line Items]
Well Service Rigs			10
Subsequent Event [Member] | Colombia [Member] | Drilling Services Segment [Member]
Segment Reporting Information [Line Items]
Drilling Rigs			8