Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues:
Oil and natural gas	$ 164,799	$ 131,166	$ 318,408	$ 266,931
Contract drilling	105,005	146,872	212,533	287,778
Gas gathering and processing	70,617	49,747	128,012	107,042
Total revenues	340,421	327,785	658,953	661,751
Oil and natural gas:
Operating costs	44,994	33,279	88,032	68,888
Depreciation, depletion, and amortization	55,335	57,153	107,318	109,350
Impairment of oil and natural gas properties (Note 2)	0	115,874	0	115,874
Contract drilling:
Operating costs	63,590	74,819	129,592	150,992
Depreciation	17,908	21,238	35,168	42,566
Gas gathering and processing:
Operating costs	59,557	42,363	108,967	89,976
Depreciation and amortization	8,214	5,312	15,370	10,446
General and administrative	9,679	8,376	18,352	15,380
Gain on dispostion of assets	(3,483)	(651)	(3,399)	(1,239)
Total operating expenses	255,794	357,763	499,400	602,233
Income (loss) from operations	84,627	(29,978)	159,553	59,518
Other income (expense):
Interest, net	(4,591)	(2,542)	(8,152)	(4,368)
Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net	16,344	1,387	10,420	(606)
Other	(91)	69	(157)	(64)
Total other income (expense)	11,662	(1,086)	2,111	(5,038)
Income (loss) before income taxes	96,289	(31,064)	161,664	54,480
Income tax expense (benefit):
Current	2,117	(2,066)	4,634	(2,066)
Deferred	35,165	(9,696)	57,817	23,409
Total income taxes	37,282	(11,762)	62,451	21,343
Net income (loss)	$ 59,007	$ (19,302)	$ 99,213	$ 33,137
Net income (loss) per common share:
Basic	$ 1.22	$ (0.40)	$ 2.06	$ 0.69
Diluted	$ 1.22	$ (0.40)	$ 2.05	$ 0.69