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Debt (Tender Offer and Redemption of Notes) (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2012 10.25% Senior notes due 2014	Mar. 31, 2012 8.25% Senior subordinated notes due 2016	Apr. 09, 2012 Redemption of Notes 8.25% Senior subordinated notes due 2016
Debt Instrument
Increased credit facility borrowing base per dollar of senior notes redeemed	$ 0.25
Aggregate principal of tender offer	150,000,000
Redemption of subordinated debt		$ 200,000,000	$ 215,500,000

The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets or underlying collateral.

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