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Long-Term Debt (Details of the Company's Credit Agreement) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]    
Amount drawn $ 4,721,909 $ 4,375,885 [1]
Revolving Credit Facility [Member] | Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Available 1,257,856 538,642
Amount drawn [1] $ 178,749 $ 916,247
Commitment - rate applicable 0.15% 0.12%
Letter of Credit [Member] | Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Letter of credit $ 125,895 $ 107,611
LIBOR [Member] | Revolving Credit Facility [Member] | Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Amount drawn $ 175,000 $ 897,000
Interest rate applicable 1.35% 2.90%
LIBOR [Member] | Term Loan Facility [Member] | Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Amount drawn $ 650,000 $ 700,000
Interest rate applicable 1.35% 2.90%
Canadian Bankers Acceptance Loan [Member] | Revolving Credit Facility [Member] | Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Amount drawn $ 3,749 $ 19,247
Interest rate applicable 1.68% 3.18%
[1] Interest rates represent the interest rates incurred at September 30, 2020