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Long-Term Debt and Credit Facilities - Long-Term Debt Outstanding (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jul. 12, 2017
Debt instruments                  
Total debt $ 1,434,875       $ 1,335,660        
Less: Current portion of long-term debt (36,490) $ (37,237) $ (38,929) $ (32,821) (29,237) $ (20,062) $ (19,799) $ (21,170)  
Long-term debt, net of current maturities 1,398,385 $ 1,367,583 $ 1,331,898 $ 1,336,152 1,306,423 $ 1,307,884 $ 1,278,197 $ 1,277,029  
Debt discount                 $ 7,000
Senior secured notes                  
Debt instruments                  
Total debt 979,060       974,443        
Other                  
Debt instruments                  
Total debt 30,232       25,321        
First lien credit agreement                  
Debt instruments                  
Total debt 360,583       335,896        
Debt discount 6,500       8,300        
Unamortized debt issuance costs 18,900       24,500        
Senior secured notes                  
Debt instruments                  
Debt discount 14,900       18,200        
Unamortized debt issuance costs 6,000       $ 7,300        
Revolver                  
Debt instruments                  
Total debt $ 65,000