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Long-term Debt - Debt Summary (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Long-term Debt    
Long-term debt $ 1,689,502 $ 1,735,198
Less current maturities of long-term debt (81,741) (92,108)
Less net discounts (636) (686)
Less debt issuance costs, net of accumulated amortization of $16.9 million and $13.3 million, respectively (17,909) (23,553)
Long-term debt, net of current maturities and debt issuance costs 1,589,216 1,618,851
Accumulated amortization for debt issuance costs 18,700 13,300
Senior Secured Credit Facility    
Long-term Debt    
Long-term debt 1,232,818 1,259,740
$300 million 5.875% senior unsecured notes due November 1, 2021    
Long-term Debt    
Long-term debt $ 300,000 $ 300,000
Interest rate (as a percent) 5.875% 5.875%
Principal amount $ 300,000  
Other long-term obligations    
Long-term Debt    
Long-term debt 154,469 $ 146,992
Capital leases    
Long-term Debt    
Long-term debt $ 2,215 $ 28,466