Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues
Oil and natural gas	$ 649,718	$ 567,944	$ 514,614
Contract drilling	414,778	529,719	484,651
Gas gathering and processing	287,354	217,460	208,238
Total revenues	1,351,850	1,315,123	1,207,503
Oil and natural gas
Operating costs	184,001	150,212	131,271
Depreciation, depletion, and amortization	226,498	211,347	183,350
Impairment of oil and natural gas properties (Note 2)	0	283,606	0
Contract drilling
Operating costs	247,280	289,524	269,899
Depreciation	71,194	81,007	79,667
Gas gathering and processing
Operating costs	243,406	187,292	174,859
Depreciation, amortization, and impairment	33,191	24,388	16,101
General and administrative	38,323	33,086	30,055
(Gain) loss on disposition of assets	(17,076)	(253)	595
Total expenses	1,026,817	1,260,209	885,797
Income from operations	325,033	54,914	321,706
Other income (expense):
Interest, net	(15,015)	(14,137)	(4,167)
Gain (loss) on derivatives not designated as hedges and hedge ineffectiveness, net	(8,374)	(1,243)	1,702
Other	(175)	(132)	(239)
Total other expense	(23,564)	(15,512)	(2,704)
Income before income taxes	301,469	39,402	319,002
Income tax expense (benefit):
Current	15,991	696	(2,416)
Deferred	100,732	15,530	125,551
Total income taxes	116,723	16,226	123,135
Net income	$ 184,746	$ 23,176	$ 195,867
Net income per common share:
Basic	$ 3.83	$ 0.48	$ 4.11
Diluted	$ 3.80	$ 0.48	$ 4.08