Segment Information (Schedule of Segment Reporting Information) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Identifiable assets	$ 829,776				$ 1,171,589				$ 829,776	$ 1,171,589	$ 1,229,623
Drilling Services Revenue									249,318	516,473	528,327
Drilling Services Costs and Expenses									144,196	348,133	354,380
Production Services Revenue									291,460	538,750	431,859
Production Services Costs and Expenses									213,820	339,690	276,296
Revenues	104,473	$ 107,480	$ 135,011	$ 193,814	283,110	$ 273,267	$ 259,812	$ 239,034	540,778	1,055,223	960,186
Operating Costs									358,016	687,823	630,676
Segment Margin									182,762	367,400	329,510
Depreciation and amortization									150,939	183,376	187,918
Capital Expenditures									142,907	188,121	125,420
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	30,038				25,847				30,038	25,847	30,226
Revenues									0	0	0
Operating Costs									0	0	0
Segment Margin									0	0	0
Depreciation and amortization									1,339	1,336	1,113
Capital Expenditures									619	986	2,171
Drilling Services Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	518,208				702,987				518,208	702,987	785,119
Segment Margin									105,122	168,340	173,947
Depreciation and amortization									80,265	115,714	122,201
Capital Expenditures									113,060	112,483	78,708
Production Services Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	$ 281,530				$ 442,755				281,530	442,755	414,278
Segment Margin									77,640	199,060	155,563
Depreciation and amortization									69,335	66,326	64,604
Capital Expenditures									$ 29,228	$ 74,652	$ 44,541