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Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Long-term Debt    
Long-term debt $ 1,712,486 $ 1,267,637
Less current maturities of long-term debt (87,801) (30,853)
Less discount on senior secured credit facility Term Loan B (928) (1,056)
Less debt issuance costs, net of accumulated amortization of $11.4 million and $6.8 million, respectively (24,944) (25,151)
Long-term debt, net of current maturities 1,598,813 1,210,577
Accumulated amortization for debt issuance costs 11,400 6,800
Senior secured credit facility    
Long-term Debt    
Long-term debt 1,236,597 807,500
$300 million 5.875% senior unsecured notes due November 1, 2021    
Long-term Debt    
Long-term debt $ 300,000 300,000
Debt instrument interest rate stated percentage 5.875%  
Principal amount $ 300,000  
Other long-term obligations    
Long-term Debt    
Long-term debt 146,992 135,000
Capital leases    
Long-term Debt    
Long-term debt $ 28,897 $ 25,137