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Long-term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2015
Dec. 31, 2014
Long-term Debt    
Debt and Capital Lease Obligations, Total $ 1,306,051 $ 1,267,637
Less current maturities of long-term debt (40,890) (30,853)
Less discount on senior secured credit facility Term Loan B (1,014) (1,056)
Less debt issuance costs, net of accumulated amortization of $9.7 million and $6.8 million, respectively (23,688) (25,151)
Long-term debt, net of current maturities and debt issuance costs 1,240,459 1,210,577
Debt issuance costs, accumulated amortization 8,300 6,800
Senior Secured Credit Facility    
Long-term Debt    
Debt and Capital Lease Obligations, Total 830,625 807,500
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 150,300 135,000
Capital leases    
Long-term Debt    
Debt and Capital Lease Obligations, Total $ 25,126 $ 25,137