Segment Information (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 segments	Dec. 31, 2013
Segment Reporting Information [Line Items]
Number of Reportable Segments	2
Property, Plant and Equipment, Gross	$ 1,740,920	$ 1,724,124
Drilling Services Segment [Member]
Segment Reporting Information [Line Items]
Drilling Rigs	62
Production Services Segment [Member]
Segment Reporting Information [Line Items]
Well Servicing Rigs	109
Wireline Units	120
Coiled Tubing Units	13
Production Services Segment [Member] | Fishing and Rental Tools and Equipment [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Gross	$ 17,400
Production Services Segment [Member] | 550 Horsepower [Member]
Segment Reporting Information [Line Items]
Well Servicing Rigs	99
Production Services Segment [Member] | 600 Horsepower [Member]
Segment Reporting Information [Line Items]
Well Servicing Rigs	10
Colombia [Member] | Drilling Services Segment [Member]
Segment Reporting Information [Line Items]
Drilling Rigs	8
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