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Debt (Narrative) (Details) - USD ($)
12 Months Ended
Aug. 14, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Aug. 13, 2020
Dec. 21, 2016
Debt [Line Items]            
Maximum borrowing capacity $ 630,000,000.0          
Debt issue costs incurred   $ 2,278,000        
Debt issue costs deferred   2,038,000        
Debt issue costs   2,038,000        
Unamortized deferred debt issue costs   2,953,000        
Repayment of debt   13,711,000 $ 76,282,000 $ 91,013,000    
Senior Unsecured Notes [Member]            
Debt [Line Items]            
Unamortized deferred debt issue costs   $ 7,266,000 $ 9,067,000      
Revolving Credit Facility [Member]            
Debt [Line Items]            
Weighted average interest rate   2.30% 2.30%      
Committed Revolving Credit Facilities [Member]            
Debt [Line Items]            
Maximum borrowing capacity   $ 455,124,000        
Available borrowing capacity   450,124,000        
5.375% Senior Unsecured Note, Due January 2025 [Member] | Senior Unsecured Notes [Member]            
Debt [Line Items]            
Principal amount           $ 500,000,000
Outstanding debt   $ 500,000,000 $ 500,000,000      
Interest rate   5.375%       5.375%
Maturity date   Jan. 01, 2025        
Revolving Credit Facility [Member]            
Debt [Line Items]            
Debt issue costs deferred   $ 2,038,000        
Multicurrency Revolving Facilities [Member]            
Debt [Line Items]            
Maximum borrowing capacity $ 530,000,000.0       $ 490,000,000.0  
Percentage of increase to margin for base rate loans and LIBOR loans at each pricing tier level 0.50%          
Percentage of increase per annum to calculate commitment fee for unused commitments at each pricing tier level 0.10%          
Prepayment of debt $ 41,000,000.0          
Delayed-draw Term Loan Facility [Member]            
Debt [Line Items]            
Maximum borrowing capacity $ 100,000,000          
Outstanding debt         $ 141,000,000.0  
Amortize in equal quarterly installments (as a percent) 10.00%          
Term Loan Facility [Member]            
Debt [Line Items]            
Prepayment of debt   $ 13,711,000 62,690,000      
Repayment of debt     $ 13,592,000