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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Supplemental Cash Flow Elements [Abstract]    
Interest paid $ 104,417 $ 123,258
Income taxes paid 15,812 4,997
Right-of-use assets obtained in exchange for lease obligations:    
Finance leases 5,622 5,511
Operating leases 30,274 52,640
Capital expenditures acquired but not yet paid $ 167,587 $ 75,576