Debt (10.25% Senior Notes Due 2014) (Details) (USD $)	12 Months Ended			0 Months Ended			12 Months Ended			3 Months Ended	0 Months Ended		3 Months Ended	0 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Apr. 03, 2012 Senior Notes 10.25 Percent Due 2014	Aug. 13, 2009 Senior Notes 10.25 Percent Due 2014	May 27, 2009 Senior Notes 10.25 Percent Due 2014	Dec. 31, 2012 Senior Notes 10.25 Percent Due 2014	Dec. 31, 2011 Senior Notes 10.25 Percent Due 2014	Dec. 31, 2010 Senior Notes 10.25 Percent Due 2014	Oct. 31, 2011 Repayment of Debt 10.25% Bond Repurchases	May 27, 2009 Lien Term Loan Senior Notes 10.25 Percent Due 2014	Apr. 03, 2012 Premium Paid Over Par Senior Notes 10.25 Percent Due 2014	Oct. 31, 2011 Premium Paid Over Par Repayment of Debt 10.25% Bond Repurchases	Apr. 03, 2012 Write-off of Deferred Debt Issuance Cost and Net Discount Senior Notes 10.25 Percent Due 2014
Debt Instrument
Interest rate on debt instrument (as a percent)							10.25%
Debt Instrument, Face Amount					$ 125,000,000	$ 325,000,000
Discount on issuance (as a percent)						93.546%
Unamortized discount						21,000,000	2,340,000	6,564,000
Net proceeds from Issuance long-term debt					129,100,000	295,100,000	0	0	300,000,000
Aggregate purchase price for repurchase of notes										108,800,000	140,000,000
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 and accrued and unpaid interest							100.00%
Aggregate principal amount of notes repurchased										94,700,000
Loss on repurchase of notes	41,545,000	15,544,000	573,000	30,900,000						15,000,000		26,400,000	11,500,000	4,500,000
Extinguishment of debt	6,842,000	4,072,000	573,000							3,500,000
Aggregate principal amount under tender offer				150,000,000
Repayments of Unsecured Debt				181,500,000
Unsecured Debt				$ 205,300,000