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Debt (Narrative) (Details)
12 Months Ended
Sep. 21, 2021
USD ($)
Dec. 21, 2016
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 21, 2021
USD ($)
Sep. 20, 2021
USD ($)
Sep. 20, 2021
CAD ($)
Aug. 14, 2020
USD ($)
Debt [Line Items]                  
Repayment of debt     $ 5,328,000 $ 13,711,000 $ 76,282,000        
Redemption price percentage     100.00%            
Unamortized deferred debt issue costs     $ 5,699,000            
GS Bank [Member]                  
Debt [Line Items]                  
Unamortized deferred debt issue costs     $ 10,000,000            
Revolving Credit Facility [Member]                  
Debt [Line Items]                  
Weighted average interest rate     1.80% 2.30%          
Third Amendment of the Credit Agreement [Member]                  
Debt [Line Items]                  
Maximum borrowing capacity                 $ 630,000,000
Fourth Amendment of the Credit Agreement [Member]                  
Debt [Line Items]                  
Maximum borrowing capacity $ 1,045,000,000                
Debt issue costs incurred     $ 4,262,000            
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          
Unamortized deferred debt issue costs     $ 5,469,000 7,266,000          
Interest rate   5.375% 5.375%            
Maturity date   Jan. 15, 2025 Jan. 01, 2025            
4.75% Senior Unsecured Note, Due January 15, 2025 [Member] | Senior Unsecured Notes [Member]                  
Debt [Line Items]                  
Outstanding debt     $ 600,000,000            
Unamortized deferred debt issue costs     $ 1,948,000            
Interest rate     4.75%            
Maturity date     Dec. 01, 2031            
4.95% Senior Unsecured Note, Due January 15, 2025 [Member] | Senior Unsecured Notes [Member]                  
Debt [Line Items]                  
Outstanding debt     $ 333,464,000            
Unamortized deferred debt issue costs     $ 1,127,000            
Interest rate     4.95%            
Maturity date     Dec. 01, 2029            
2021 USD Notes [Member]                  
Debt [Line Items]                  
Principal amount           $ 600,000,000      
Unamortized deferred debt issue costs     $ 1,954,000            
Interest rate           4.75%      
2021 CAD Notes [Member]                  
Debt [Line Items]                  
Principal amount           $ 425,000,000      
Unamortized deferred debt issue costs     1,129,000            
Interest rate           4.95%      
Revolving Credit Facility [Member] | Revolving credit facilities, Maturing September 2026 [Member]                  
Debt [Line Items]                  
Available borrowing capacity     515,581,000            
Revolving Credit Facility [Member] | Revolving credit facilities, Maturing October 2023 [Member]                  
Debt [Line Items]                  
Available borrowing capacity     5,000,000            
Revolving Credit Facility [Member] | Revolving credit facilities, No Maturity [Member]                  
Debt [Line Items]                  
Available borrowing capacity     5,000,000            
Multicurrency Revolving Facilities [Member] | Third Amendment of the Credit Agreement [Member]                  
Debt [Line Items]                  
Maximum borrowing capacity                 530,000,000
Delayed-draw Term Loan Facility [Member]                  
Debt [Line Items]                  
Outstanding debt             $ 90,000,000 $ 118,889,995  
Delayed-draw Term Loan Facility [Member] | Third Amendment of the Credit Agreement [Member]                  
Debt [Line Items]                  
Maximum borrowing capacity                 $ 100,000,000
Delayed-draw Term Loan Facility [Member] | Fourth Amendment of the Credit Agreement [Member]                  
Debt [Line Items]                  
Maximum borrowing capacity $ 295,000,000   205,000,000            
Annual amortization rate 5.00%                
Term Loan Facility [Member]                  
Debt [Line Items]                  
Repayment of debt     5,328,000 13,711,000          
Prepayment of debt     $ 0 $ 0