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Long-term Debt (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Long-term Debt    
Debt $ 1,063,616 $ 1,052,015
Less current maturities of long-term debt (27,600) (27,598)
Less discount on debt (1,181) (1,223)
Long-term debt, net of current maturities 1,034,835 1,023,194
Senior secured credit facility
   
Long-term Debt    
Debt 743,125 750,000
$300 million 5.875% senior unsecured notes due November 1, 2021
   
Long-term Debt    
Debt 300,000 300,000
Debt instrument interest rate stated percentage 5.875%  
Other long-term obligations
   
Long-term Debt    
Debt 18,500  
Capital leases
   
Long-term Debt    
Debt $ 1,991 $ 2,015