Debt 9.5% Senior Notes due 2018 (Details) (USD $)	12 Months Ended										12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Senior Notes, due Oct 2018, fixed rate 9.5% [Member]	Dec. 31, 2010 Senior Notes, due Oct 2018, fixed rate 9.5% [Member]	Oct. 19, 2010 Senior Notes, due Oct 2018, fixed rate 9.5% [Member]	Dec. 31, 2011 Senior Secured Revolving Credit Facility [Member]	Oct. 08, 2010 Senior Secured Revolving Credit Facility [Member]	Dec. 31, 2011 Amended Senior Secured Revolving Credit Facility [Member]	Oct. 08, 2010 Amended Senior Secured Revolving Credit Facility [Member]	Dec. 31, 2011 October 2010 Refinancing [Member]	Dec. 31, 2010 October 2010 Refinancing [Member]	Oct. 08, 2010 October 2010 Refinancing [Member]	Dec. 31, 2011 Other Assets [Member]	Dec. 31, 2010 Other Assets [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 825,000,000		$ 50,000,000
Expenses and Fees Amortization Period				8 years
Deferred Finance Costs, Net				28,200,000			800,000		800,000					21,700,000	26,800,000
Interest Expense Debt and Debt Discount	132,707,000	171,537,000	186,258,000	2,700,000	600,000						3,400,000	600,000
Loss on extinguishment of debt	11,159,000	107,003,000	(45,678,000)	3,100,000	800,000						3,100,000	500,000
Debt Instrument, Unamortized Discount	29,500,000	28,500,000							7,400,000	7,400,000			29,600,000
Period of Payment Outstanding Causing Default Under the Indenture	30 days
2012	7,400,000
2013	7,400,000
2014	7,400,000
2015	7,400,000
2016	7,400,000
Thereafter	1,381,800,000
Long-term Debt	$ 1,418,800,000	$ 1,640,500,000
Debt Instrument, Interest Rate, Effective Percentage [Abstract]
Debt Instrument, Interest Rate, Stated Percentage						9.50%
Debt Instrument, Interest Rate, Effective Percentage	5.58%			10.85%
Comulsory Purchase Price Under Change of Control	101.00%
Comulsory Purchase Price Under Sale of Assets Under Certain Circumstances	100.00%
Minimum Aggregate Principal Amount Required for Trustees or Other Holders to Declare Principal and Accrued Interest Immediately Due	25.00%
Maximum Amount of Aggregate Principal Redeemed With Net Proceeds Raised in One or More Equity Offerings	35.00%