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SUPPLEMENTAL CASH FLOW INFORMATION - Summary (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Supplemental Cash Flow Information [Abstract]      
Income taxes paid, net of refunds $ 308,620 $ 146,739 $ 101,302
Interest paid $ 343,213 $ 206,562 $ 177,525