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Acquisitions and Divestitures (CCA PPA) (Details) (Cedar Creek Anticline [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Business Acquisition [Line Items]
Cash payment	$ 988,982
Other assets	1,884
Asset retirement obligations	(7,209)
Business Acquisition, Purchase Price Allocation, Assets Acquired Less (Liabilities Assumed)	988,982
Proved Properties [Member]
Business Acquisition [Line Items]
Oil and natural gas properties	771,487
Unevaluated Properties [Member]
Business Acquisition [Line Items]
Oil and natural gas properties	$ 222,820

The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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