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Schedule of Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 19, 2018
Dec. 31, 2017
Dec. 22, 2017
Debt Instrument [Line Items]        
Senior notes   $ 100,000   $ 300,000
Total debt $ 741,938      
Current portion of debt 20,313   $ 19,688  
Long-term debt 1,098,567   593,572  
2018 (amount remaining at June 30, 2018) 8,125      
2019 28,438      
2020 44,777      
2021 60,938      
2022 65,000      
2023 534,660      
Secured Debt [Member]        
Debt Instrument [Line Items]        
Total debt 1,141,938   619,477  
Current portion of debt 20,313   19,688  
Long-term debt 1,098,567   593,572  
USD Denominated Term Loan [Member]        
Debt Instrument [Line Items]        
USD denominated term loan 645,938   194,063  
Deferred Finance Costs, Noncurrent, Net 5,559   629  
Line of Credit [Member]        
Debt Instrument [Line Items]        
Multicurrency revolving line of credit 96,000   125,414  
Senior Notes [Member]        
Debt Instrument [Line Items]        
Senior notes 400,000   300,000  
Deferred Finance Costs, Noncurrent, Net $ 17,499   $ 5,588