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Debt (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 21, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 20, 2021
USD ($)
Sep. 20, 2021
CAD ($)
Dec. 31, 2020
USD ($)
Aug. 14, 2020
USD ($)
Dec. 21, 2016
USD ($)
Senior Unsecured Notes [Member]                
Debt [Line Items]                
Unamortized deferred debt issue costs   $ 5,922,000 $ 5,922,000     $ 7,266,000    
Revolving Credit Facility [Member]                
Debt [Line Items]                
Weighted average interest rate   1.80% 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            
Unamortized deferred debt issue costs   6,106,000 $ 6,106,000          
Committed Revolving Credit Facilities [Member]                
Debt [Line Items]                
Maximum borrowing capacity   686,313,000 686,313,000          
Available borrowing capacity   676,313,000 676,313,000          
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     $ 500,000,000    
Interest rate   5.375% 5.375%         5.375%
Maturity date     Jan. 15, 2025          
Revolving Credit Facility [Member] | Committed Revolving Credit Facilities [Member]                
Debt [Line Items]                
Maturity date     Sep. 21, 2026          
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              
Remaining borrowing capacity $ 205,000,000              
Annual amortization rate 5.00%