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Debt (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Components of debt    
Term loan $ 210,000 $ 198,923
Original issue discount (470) (1,306)
Total Debt 209,530 198,923
Current maturities    (2,043)
Total long-term debt 209,530 196,880
Term loan [Member]
   
Components of debt    
Term loan    200,229
Senior secured notes [Member]
   
Components of debt    
Term loan 210,000   
Revolving credit facility [Member]
   
Components of debt    
Term loan