Debt (Tender Offer and Redemption of Notes) (Details) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Apr. 03, 2012 10.25% Senior notes due 2014	Apr. 09, 2012 8.25% Senior subordinated notes due 2016	Apr. 03, 2012 Premium Paid Over Par 10.25% Senior notes due 2014	Apr. 09, 2012 Premium Paid Over Par 8.25% Senior subordinated notes due 2016	Apr. 03, 2012 Write-off of Deferred Debt Issuance Cost and Net Discount 10.25% Senior notes due 2014
Debt Instrument
Aggregate principal amount of tender offer					$ 150,000,000
Repayments of unsecured debt					181,500,000
Loss on extinguishment of debt	0	(14,391,000)	(41,545,000)	(14,391,000)	(30,900,000)	(10,600,000)	(26,400,000)	(8,300,000)	(4,500,000)
Remaining unsecured debt after redemption					205,300,000
Extinguishment of debt, amount						200,000,000
Repayments of subordinated debt						215,500,000
Write off of deferred debt issuance cost						$ 2,300,000