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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Mar. 23, 2016
Dec. 31, 2014
Dec. 31, 2013
Mar. 20, 2013
Debt [Line Items]            
Debt Issuance Costs, Line of Credit Arrangements, Gross $ (14,036) $ (17,587)        
Debt, long-term and short-term, combined amount, total 954,107 882,413        
Capital Lease Obligations 478 706        
Debt and capital lease obligations 954,585 883,119        
Less: Current portion (356) (313)        
Long-term debt, less current portion 954,229 882,806        
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%
Wells Fargo Capital Finance, Llc [Member] | Revolving Credit Facility [Member]            
Debt [Line Items]            
Long-term Line of Credit $ 68,143 $ 0