Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 segment		Mar. 31, 2013		Dec. 31, 2013
Segment Reporting [Abstract]
Number of reportable operating segments	2
Segment Information
Revenues	$ 124,605		$ 106,867
Depreciation, depletion and amortization	39,661	[1]	108,600	[1]
Other operating expenses	50,365	[2]	49,150	[2]
Interest expense	12,521		10,571
Other (income) expense	4,201		4,586
Income (loss) before income taxes	17,857		(66,040)
Income tax (expense) benefit	(6,465)		24,831
Net income (loss)	11,392		(41,209)
Total assets	1,362,830		1,532,865		1,366,737
Additions to property and equipment	92,199		69,340
Oil and Gas
Segment Information
Revenues	117,720		101,550
Depreciation, depletion and amortization	37,382	[1]	105,540	[1]
Other operating expenses	45,447	[2]	44,019	[2]
Interest expense	12,521		10,571
Other (income) expense	4,201		4,586
Income (loss) before income taxes	18,169		(63,166)
Income tax (expense) benefit	(6,347)		23,654
Net income (loss)	11,822		(39,512)
Total assets	1,332,223		1,499,796
Additions to property and equipment	85,193		68,592
Contract Drilling
Segment Information
Revenues	13,420		10,712
Depreciation, depletion and amortization	3,168	[1]	3,748	[1]
Other operating expenses	9,914	[2]	10,326	[2]
Interest expense	0		0
Other (income) expense	0		0
Income (loss) before income taxes	338		(3,362)
Income tax (expense) benefit	(118)		1,177
Net income (loss)	220		(2,185)
Total assets	58,245		58,548
Additions to property and equipment	7,657		260
Intercompany Eliminations
Segment Information
Revenues	(6,535)		(5,395)
Depreciation, depletion and amortization	(889)	[1]	(688)	[1]
Other operating expenses	(4,996)	[2]	(5,195)	[2]
Interest expense	0		0
Other (income) expense	0		0
Income (loss) before income taxes	(650)		488
Income tax (expense) benefit	0		0
Net income (loss)	(650)		488
Total assets	(27,638)		(25,479)
Additions to property and equipment	$ (651)		$ 488

[1] Includes impairment of property and equipment.

[2] Includes the following expenses: production, exploration, midstream services, drilling rig services, accretion of asset retirement obligations, general and administrative and other operating expenses.