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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Supplemental Cash Flow Elements [Abstract]    
Interest paid $ 177,426 $ 166,720
Income taxes paid 9,918 15,528
Right-of-use assets obtained in exchange for lease obligations:    
Finance leases 7,551 15,336
Operating leases 88,646 70,365
Capital expenditures acquired but not yet paid $ 69,981 $ 185,264