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Debt - Schedule of Debt (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Jan. 19, 2018
Dec. 22, 2017
Debt Instrument [Line Items]        
Notes payable     $ 100,000,000 $ 300,000,000
Total debt $ 936,094,000      
Current portion of debt 18,359,000 $ 0    
Long-term debt, net 902,577,000 932,482,000    
USD Denominated Term Loan [Member]        
Debt Instrument [Line Items]        
Loans payable to bank 536,094,000 550,156,000    
Debt issuance costs, noncurrent, net 3,469,000 3,661,000    
Line of Credit [Member]        
Debt Instrument [Line Items]        
Long-term line of credit 0 0    
Senior Notes [Member]        
Debt Instrument [Line Items]        
Notes payable 400,000,000 400,000,000    
Debt issuance costs, noncurrent, net 11,689,000 14,013,000    
Secured Debt [Member]        
Debt Instrument [Line Items]        
Total debt 936,094,000 950,156,000    
Current portion of debt [1] 18,359,000 0    
Long-term debt, net $ 902,577,000 $ 932,482,000    
[1] (1)    During 2019 we made debt prepayments on the term loan in excess of required principal payments, reducing the current portion of debt to zero at December 31, 2019.