Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues:
Contract drilling	$ 484,651	$ 316,384	$ 236,315
Oil and natural gas	516,316	400,807	357,879
Gas gathering and processing	208,238	154,516	108,628
Other	(834)	10,138	7,076
Total revenues	1,208,371	881,845	709,898
Contract drilling:
Operating costs	269,899	186,813	140,080
Depreciation	79,667	69,970	45,326
Oil and natural gas:
Operating costs	131,271	105,365	87,734
Depreciation, depletion and amortization	183,350	118,793	114,681
Impairment of oil and natural gas properties (Note 2)	0	0	281,241	[1]
Gas gathering and processing:
Operating costs	174,859	122,146	87,908
Depreciation and amortization	16,101	15,385	16,104
General and administrative	30,055	26,152	24,011
Interest, net	4,167	0	539
Total expenses	889,369	644,624	797,624
Income (loss) before income taxes	319,002	237,221	(87,726)
Income tax expense (benefit):
Current	(2,416)	(9,935)	(223)
Deferred	125,551	100,672	(32,003)
Total income taxes	123,135	90,737	(32,226)
Net income (loss)	$ 195,867	$ 146,484	$ (55,500)
Net income (loss) per common share:
Basic	$ 4.11	$ 3.10	$ (1.18)
Diluted	$ 4.08	$ 3.09	$ (1.18)

[1] In March 2009, we incurred a $281.2 million pre-tax ($175.1 million net of tax) non-cash write down of our oil and natural gas properties due to low commodity prices existing at the end of the first quarter 2009.