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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Supplemental Cash Flow Elements [Abstract]    
Interest paid $ 48,039 $ 60,566
Income taxes paid 4,885 5,096
Right-of-use assets obtained in exchange for lease obligations:    
Finance leases 2,851 3,744
Operating leases 16,645 23,877
Capital expenditures acquired but not yet paid $ 134,384 $ 144,538