Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues:
Contract drilling	$ 140,906	$ 97,988
Oil and natural gas	133,772	109,834
Gas gathering and processing	57,295	39,764
Other	455	(181)
Total revenues	332,428	247,405
Contract drilling:
Operating costs	76,173	52,844
Depreciation	21,328	17,297
Oil and natural gas:
Operating costs	35,609	30,781
Depreciation, depletion and amortization	52,197	40,268
Gas gathering and processing:
Operating costs	47,613	29,055
Depreciation and amortization	5,134	3,773
General and administrative	7,004	6,892
Interest, net	1,826	54
Total operating expenses	246,884	180,964
Income before income taxes	85,544	66,441
Income tax expense:
Current	0	0
Deferred	33,105	25,414
Total income taxes	33,105	25,414
Net income	$ 52,439	$ 41,027
Net income per common share:
Basic	$ 1.10	$ 0.86
Diluted	$ 1.09	$ 0.86