Debt (10.25% Senior Notes Due 2014) (Details) (USD $)	12 Months Ended					0 Months Ended		12 Months Ended		2 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 10.25% Senior notes due 2014	Dec. 31, 2010 10.25% Senior notes due 2014	Aug. 13, 2009 Unsecured Debt 10.25% Senior notes due 2014	May 27, 2009 Unsecured Debt 10.25% Senior notes due 2014	Dec. 31, 2011 Unsecured Debt 10.25% Senior notes due 2014	Sep. 30, 2011 Unsecured Debt 10.25% Senior notes due 2014	Sep. 30, 2011 Unsecured Debt Buy back of notes 10.25% Bond Repurchases	Dec. 31, 2011 Unsecured Debt Buy back of notes 10.25% Bond Repurchases	Oct. 31, 2011 Unsecured Debt Buy back of notes 10.25% Bond Repurchases
Debt Instrument
Interest rate on debt instrument (as a percent)				10.25%	10.25%			10.25%	10.25%			10.25%
Principal amount of debt issued						$ 125,000,000	$ 325,000,000
Discount on issuance (as a percent)							93.546%
Unamortized discount				6,564,000	11,035,000		21,000,000
Net proceeds from Issuance long-term debt						129,100,000	295,100,000
Aggregate purchase price for repurchase of notes							140,000,000	108,800,000
Premium on issuance (as a percent)						104.75%
Unamortized premium						6,000,000
Debt Instrument redemption price percentage of principal amount plus make whole premium, plus accrued and unpaid interest (as a percent)								100.00%
Aggregate principal amount of notes repurchased										94,700,000
Loss on repurchase of notes	15,544,000	573,000	10,823,000					15,000,000
Premium paid on debt extinguishment								11,500,000
Extinguishment of debt	$ 4,072,000	$ 573,000	$ 10,823,000								$ 3,500,000