Debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 Term loan [Member]	Dec. 31, 2012 Senior secured notes [Member]	Jun. 30, 2012 Senior secured notes [Member]	Dec. 31, 2012 Revolving credit facility [Member]	Dec. 31, 2011 Revolving credit facility [Member]
Components of debt
Term loan			$ 198,923
Senior secured notes				210,000	210,000
Original issue discount	(452)	(1,306)
Total debt	209,548	198,923
Current maturities		(2,043)
Total long-term debt	$ 209,548	$ 196,880		$ 209,548