Long-Term Debt (Schedule of Debt) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Discount	$ (18,783)	$ (19,713)
Total Long-term Debt	1,207,967	1,208,237
Less current maturities	(4,720)	(4,720)
Long-term debt, less current maturities	1,203,247	1,203,517
Senior Secured Credit Facility, due Oct 2017, variable rate 3.75%
Debt Instrument [Line Items]
Debt interest rate (percent)	3.75%	3.75%
Senior secured credit facility due	466,000	467,200
Senior Notes due Oct 2018, at a fixed rate 9.5%
Debt Instrument [Line Items]
Debt interest rate (percent)	9.50%	9.50%
Senior Notes due October 2018, at a fixed rate of 9.5%	$ 760,750	$ 760,750