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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Mar. 23, 2016
Dec. 31, 2014
Dec. 31, 2013
Mar. 20, 2013
Debt [Line Items]            
Debt Issuance Costs, Line of Credit Arrangements, Gross $ (17,587) $ (18,420)        
Debt, long-term and short-term, combined amount, total 882,413 936,005        
Capital Leases, Future Minimum Payments Due 706 431        
Debt and capital lease obligations 883,119 936,436        
Less: Current portion 313 228        
Long-term debt, less current portion 882,806 936,208        
Six Point Five Zero Percentage Notes [Domain]            
Debt [Line Items]            
Senior notes $ 900,000 $ 900,000        
Stated interest rate 6.50%   6.50%      
6.75% Notes            
Debt [Line Items]            
Stated interest rate   6.75%   6.75% 6.75% 6.75%
Wells Fargo Capital Finance, Llc [Member] | Revolving Credit Facility [Member]            
Debt [Line Items]            
Long-term Line of Credit $ 0 $ 54,425