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Supplemental Information on Oil and Natural Gas Producing Activities - Results of Operations from Oil and Natural Gas Producing Activities (Unaudited) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Results of Operations, Oil and Gas Producing Activities Net Income (Excluding Corporate Overhead and Interest Costs) [Abstract]
Revenues	$ 1,759,282		$ 1,226,794		$ 774,763
Expenses
Production costs	524,364		368,946		267,033
Depreciation and depletion	568,029		317,246		265,914
Accretion of asset retirement obligations	28,996		9,368		9,421
Total expenses	1,121,389		695,560		542,368
Income before income taxes	637,893		531,234		232,395
Benefit of income taxes	(437,595)	[1]	(20,134)	[1]	(405,413)	[1]
Results of operations for oil and natural gas producing activities (excluding corporate overhead and interest costs)	$ 1,075,488		$ 551,368		$ 637,808
[1] Reflects the Company’s effective tax rate, including the partial valuation allowance release.

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Revenue from the sale of oil and gas during the period.

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Accretion expense of asset retirement obligations related to oil and gas producing activities.

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