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Long-Term Debt and Credit Facilities - Long-Term Debt Outstanding (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Jul. 12, 2017
Debt instruments      
Total debt $ 1,404,820 $ 1,335,660  
Less: Current portion of long-term debt (37,237) (29,237)  
Long-term debt, net of current maturities 1,367,583 1,306,423  
Senior secured notes      
Debt instruments      
Total debt 977,848 974,443  
Debt discount     $ 22,500
Other      
Debt instruments      
Total debt 23,904 25,321  
First lien credit agreement      
Debt instruments      
Total debt 364,068 335,896  
Debt discount 6,900 8,300  
Unamortized debt issuance costs 20,100 24,500  
Senior secured notes      
Debt instruments      
Debt discount 15,800 18,200  
Unamortized debt issuance costs 6,300 $ 7,300  
Revolver      
Debt instruments      
Total debt $ 39,000