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Long-term Debt - Debt Summary (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Oct. 30, 2013
Long-term Debt      
Long-term debt $ 1,432,689 $ 1,735,198  
Less current maturities of long-term debt (85,595) (92,108)  
Less net discounts (620) (686)  
Less debt issuance costs, net of accumulated amortization of $20.5 million and $13.3 million, respectively (16,535) (23,553)  
Long-term debt, net of current maturities and debt issuance costs 1,329,939 1,618,851  
Accumulated amortization for debt issuance costs 20,500 13,300  
Senior Secured Credit Facility      
Long-term Debt      
Long-term debt 976,845 1,259,740  
Senior Unsecured 5.875% Notes due November 1, 2021      
Long-term Debt      
Long-term debt 300,000 300,000 $ 300,000
Principal amount $ 300,000 $ 300,000  
Interest rate (as a percent) 5.875% 5.875% 5.875%
Other long-term obligations      
Long-term Debt      
Long-term debt $ 154,084 $ 146,992  
Capital leases      
Long-term Debt      
Long-term debt $ 1,760 $ 28,466