Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Oil and natural gas	$ 157,320	$ 135,435	$ 475,728	$ 402,366
Contract drilling	100,647	133,420	313,180	421,198
Gas gathering and processing	75,809	52,935	203,821	159,977
Total revenues	333,776	321,790	992,729	983,541
Oil and natural gas:
Operating costs	50,139	36,147	138,171	105,035
Depreciation, depletion, and amortization	56,294	44,489	163,612	153,839
Impairment of oil and natural gas properties (Note 2)	0	0	0	115,874
Contract drilling:
Operating costs	58,988	72,988	188,580	223,980
Depreciation	17,402	20,094	52,570	62,660
Gas gathering and processing:
Operating costs	63,098	46,267	172,065	136,243
Depreciation and amortization	8,773	5,884	24,143	16,330
General and administrative	9,936	8,434	28,288	23,814
Gain on disposition of assets	(4,345)	(44)	(7,744)	(1,283)
Total operating expenses	260,285	234,259	759,685	836,492
Income from operations	73,491	87,531	233,044	147,049
Other income (expense):
Interest, net	(3,625)	(7,087)	(11,777)	(11,455)
Loss on derivatives not designated as hedges and hedge ineffectiveness, net	(13,760)	(4,015)	(3,340)	(4,621)
Other	(14)	(59)	(171)	(123)
Total other income (expense)	(17,399)	(11,161)	(15,288)	(16,199)
Income before income taxes	56,092	76,370	217,756	130,850
Income tax expense:
Current	2,111	2,516	6,745	450
Deferred	19,749	27,268	77,566	50,677
Total income taxes	21,860	29,784	84,311	51,127
Net income	$ 34,232	$ 46,586	$ 133,445	$ 79,723
Net income per common share:
Basic	$ 0.71	$ 0.97	$ 2.77	$ 1.66
Diluted	$ 0.70	$ 0.97	$ 2.75	$ 1.66