Long-Term Debt (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Debt Instrument [Line Items]
Discount	$ (24,500,000)		$ (24,500,000)		$ (29,500,000)
Total Long-term Debt	1,240,100,000		1,240,100,000		1,418,800,000
Less current maturities	(7,420,000)		(7,420,000)		(7,420,000)
Long-term debt, less current maturities	1,232,707,000		1,232,707,000		1,411,448,000
Debt Instruments (Narrative) [Abstract]
Debt modification costs	0	(21,000)	0	4,103,000
Senior Secured Credit Facility, due Oct 2017, variable rate 4.25%
Debt Instrument [Line Items]
Senior Secured Credit Facility, due October 2017, at a variable interest rate of 4.25% as of September 30, 2012 and December 31, 2011	503,800,000		503,800,000		682,500,000
Senior Notes due Oct 2018, at a fixed rate 9.5%
Debt Instrument [Line Items]
Senior Notes due October 2018, at a fixed rate of 9.5%	$ 760,800,000		$ 760,800,000		$ 765,800,000