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Long-Term Debt (Details of the Company's Credit Agreement) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]    
Amount drawn $ 5,201,894 $ 4,375,885 [1]
Revolving Credit Facility [Member] | Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Available 762,561 538,642
Amount drawn [1] $ 692,623 $ 916,247
Commitment - rate applicable 0.12% 0.12%
Letter of Credit [Member] | Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Letter of credit $ 107,316 $ 107,611
LIBOR [Member] | Revolving Credit Facility [Member] | Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Amount drawn $ 675,000 $ 897,000
Interest rate applicable 2.09% 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 2.09% 2.90%
Canadian Bankers Acceptance Loan [Member] | Revolving Credit Facility [Member] | Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Amount drawn $ 17,623 $ 19,247
Interest rate applicable 2.33% 3.18%
[1] Interest rates represent the interest rates incurred at March 31, 2020