Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues:
Oil and natural gas	$ 198,498	$ 164,799	$ 386,705	$ 318,408
Contract drilling	114,278	105,005	220,878	212,533
Gas gathering and processing	92,655	70,617	185,836	128,012
Total revenues	405,431	340,421	793,419	658,953
Oil and natural gas:
Operating costs	44,723	44,994	85,138	88,032
Depreciation, depletion, and amortization	71,245	55,335	130,925	107,318
Contract drilling:
Operating costs	66,494	63,590	130,298	129,592
Depreciation	20,239	17,908	38,634	35,168
Gas gathering and processing:
Operating costs	78,648	59,557	159,608	108,967
Depreciation and amortization	10,109	8,214	19,700	15,370
General and administrative	10,600	9,679	20,237	18,352
Gain on disposition of assets	(195)	(3,483)	(9,621)	(3,399)
Total operating expenses	301,863	255,794	574,919	499,400
Income from operations	103,568	84,627	218,500	159,553
Other income (expense):
Interest, net	(4,131)	(4,591)	(7,921)	(8,152)
Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net	(10,709)	16,344	(29,075)	10,420
Other	(49)	(91)	71	(157)
Total other income (expense)	(14,889)	11,662	(36,925)	2,111
Income before income taxes	88,679	96,289	181,575	161,664
Income tax expense:
Current	8,475	2,117	18,270	4,634
Deferred	25,844	35,165	52,000	57,817
Total income taxes	34,319	37,282	70,270	62,451
Net income	$ 54,360	$ 59,007	$ 111,305	$ 99,213
Net income per common share:
Basic	$ 1.12	$ 1.22	$ 2.29	$ 2.06
Diluted	$ 1.11	$ 1.22	$ 2.27	$ 2.05