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Long-Term Debt (Details of the Company's Credit Agreement) (Details) - Credit Agreement [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Available $ 933,775 $ 1,238,937
Commitment - rate applicable 0.09% 0.15%
Long-term Debt $ 803,944 $ 203,927
US Swing Line Loan [Member]    
Line of Credit Facility [Line Items]    
Interest rate applicable 3.25%  
Margin rate for loans 0.00%  
Long-term Debt $ 11,000  
Letter of Credit [Member]    
Line of Credit Facility [Line Items]    
Letter of credit $ 112,281 $ 119,636
Base Rate [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Interest rate applicable 3.25%  
Margin rate for loans 0.00%  
Long-term Debt $ 158,000  
LIBOR [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Interest rate applicable 1.10% 1.35%
Margin rate for loans 1.00% 1.20%
Long-term Debt $ 631,000 $ 200,000
LIBOR [Member] | Term Loan Facility [Member]    
Line of Credit Facility [Line Items]    
Interest rate applicable 1.10% 1.35%
Margin rate for loans 1.00% 1.20%
Long-term Debt $ 650,000 $ 650,000
Canadian Bankers Acceptance Loan [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Interest rate applicable 1.45% 1.66%
Margin rate for loans 1.00% 1.20%
Long-term Debt $ 3,944 $ 3,927