Debt - 9.5% Senior Notes due 2018 (Details) (USD $)	12 Months Ended						12 Months Ended							12 Months Ended											0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 08, 2010	Dec. 31, 2013 Other Assets	Dec. 31, 2012 Other Assets	Dec. 31, 2013 Senior Notes, due Oct 2018, fixed rate 9.5%	Dec. 31, 2012 Senior Notes, due Oct 2018, fixed rate 9.5%	Dec. 31, 2011 Senior Notes, due Oct 2018, fixed rate 9.5%	Oct. 19, 2010 Senior Notes, due Oct 2018, fixed rate 9.5%	Dec. 31, 2013 Revolving Credit Facility	Oct. 19, 2010 Revolving Credit Facility	Oct. 08, 2010 Revolving Credit Facility	Dec. 31, 2013 Amended Senior Secured Revolving Credit Facility	Dec. 31, 2012 Amended Senior Secured Revolving Credit Facility	Dec. 31, 2011 Amended Senior Secured Revolving Credit Facility	Oct. 08, 2010 Amended Senior Secured Revolving Credit Facility	Oct. 19, 2010 Maximum Revolving Credit Facility	Oct. 19, 2010 First Step Down Revolving Credit Facility	Oct. 19, 2010 First Step Down Maximum Revolving Credit Facility	Oct. 19, 2010 First Step Down Minimum Revolving Credit Facility	Oct. 19, 2010 Second Step Down Revolving Credit Facility	Oct. 19, 2010 Second Step Down Minimum Revolving Credit Facility	Dec. 31, 2013 Debt Redemption, December 31, 2013	Oct. 19, 2010 Debt Redemption, After December 2013 and Before October 30, 2014	Dec. 31, 2013 Debt Redemption, After December 2013 and Before October 30, 2014	Dec. 31, 2013 Debt Redemption, After October 30, 2014 and Before October 30, 2015	Dec. 31, 2013 Debt Redemption, After October 30, 2015 and Ending October 30, 2016
Debt Instrument [Line Items]
Debt Instrument, Face Amount										$ 825,000,000			$ 50,000,000
Debt Instrument, Interest Rate, Stated Percentage										9.50%
Debt Instrument, Interest Rate, Effective Percentage	5.00%						10.90%
Debt Instrument, Redemption Price, Percentage																									100.00%
Debt Redemption Premium																								92,100,000		36,100,000	18,100,000	0
Maximum Amount of Aggregate Principal Redeemed With Net Proceeds Raised in One or More Equity Offerings	35.00%
Comulsory Purchase Price Under Change of Control	101.00%
Compulsory 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%	25.00%
Debt Instrument, Restrictive Covenant, General Restricted Payment Allowance												35,000,000
Percent of Excess Cash Flow Required For Mandatory Prepayment, Annual Mininum												50.00%							75.00%			100.00%
Ratio of Indebtedness to Net Capital																		5.75		5.75	5.25		5.25
Debt Instrument, Restrictive Covenants, Restricted Future Payments							112,000,000				89,000,000
Percent of Consolidated Net Income Used to Calculated Restricted Payments, Annual Mininum										50.00%
Deferred Finance Costs, Net					14,000,000	16,800,000	28,200,000				800,000
Debt Instrument, Unamortized Discount	19,800,000	23,300,000		29,600,000													7,400,000
Interest expense	100,264,000	114,338,000	132,707,000				2,700,000	2,600,000	2,700,000					3,500,000	3,400,000	3,400,000
Gains (Losses) on Extinguishment of Debt	$ (58,000)	$ (5,554,000)	$ (11,159,000)					$ (2,300,000)	$ (3,100,000)						$ 2,700,000	$ 3,100,000