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Schedule of Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Jan. 19, 2018
Dec. 22, 2017
Debt Instrument [Line Items]        
Senior notes     $ 100,000 $ 300,000
Total debt $ 987,500      
Current portion of debt 38,750 $ 28,438    
Long-term debt 930,394 988,185    
2019 (amount remaining at September 30, 2019) 6,250      
2020 44,688      
2021 60,937      
2022 65,000      
2023 410,625      
Beyond 2023 400,000      
Secured Debt [Member]        
Debt Instrument [Line Items]        
Total debt 987,500 1,037,813    
Current portion of debt 38,750 28,438    
Long-term debt 930,394 988,185    
USD Denominated Term Loan [Member]        
Debt Instrument [Line Items]        
USD denominated term loan 587,500 637,813    
Unamortized prepaid debt fees 3,758 4,859    
Line of Credit [Member]        
Debt Instrument [Line Items]        
Multicurrency revolving line of credit 0 0    
Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes 400,000 400,000    
Unamortized prepaid debt fees $ 14,598 $ 16,331