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Long-term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Long-term Debt    
Debt and Capital Lease Obligations, Total $ 1,284,123 $ 1,261,888
Less current maturities of long-term debt (44,015) (30,853)
Less discount on senior secured credit facility Term Loan B (972) (1,056)
Less debt issuance costs, net of accumulated amortization of $9.7 million and $6.8 million, respectively (22,228) (25,151)
Long-term debt, net of current maturities and debt issuance costs 1,216,908 1,204,828
Debt issuance costs, accumulated amortization (in dollars) 9,700 6,800
Senior Secured Credit Facility    
Long-term Debt    
Debt and Capital Lease Obligations, Total 813,750 807,500
Senior Unsecured 5.875% Percent Notes    
Long-term Debt    
Debt and Capital Lease Obligations, Total $ 300,000 300,000
Debt instrument interest rate stated percentage 5.875%  
Principal amount $ 300,000  
Other long-term obligations    
Long-term Debt    
Debt and Capital Lease Obligations, Total 170,196 154,189
Capital leases    
Long-term Debt    
Debt and Capital Lease Obligations, Total $ 177 $ 199