Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Oil and natural gas	$ 740,079	$ 649,718	$ 567,944
Contract drilling	476,517	414,778	529,719
Gas gathering and processing	356,348	287,354	217,460
Total revenues	1,572,944	1,351,850	1,315,123
Oil and natural gas
Operating costs	187,916	184,001	150,212
Depreciation, depletion, and amortization	276,088	226,498	211,347
Impairment of oil and natural gas properties (Note 2)	76,683	0	283,606
Contract drilling
Operating costs	274,933	247,280	289,524
Depreciation and impairment (Note 2)	159,688	71,194	81,007
Gas gathering and processing
Operating costs	306,831	243,406	187,292
Gas Gathering Transportation Marketing And Processing Depreciation, Amortization, and Impairment	47,502	33,191	24,388
General and administrative	42,023	38,323	33,086
Gain on disposition of assets	(8,953)	(17,076)	(253)
Total expenses	1,362,711	1,026,817	1,260,209
Income from operations	210,233	325,033	54,914
Other income (expense):
Interest, net	(17,371)	(15,015)	(14,137)
Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net	30,147	(8,374)	(1,243)
Other	(70)	(175)	(132)
Total other expense	12,706	(23,564)	(15,512)
Income before income taxes	222,939	301,469	39,402
Income tax expense:
Current	9,378	15,991	696
Deferred	77,285	100,732	15,530
Total income taxes	86,663	116,723	16,226
Net income	$ 136,276	$ 184,746	$ 23,176
Net income per common share:
Basic	$ 2.80	$ 3.83	$ 0.48
Diluted	$ 2.78	$ 3.80	$ 0.48