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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract]    
Interest paid $ 166,720 $ 116,506
Income taxes paid 15,528 20,181
Changes in accounts payable related to purchases of revenue earning equipment $ 41,772 $ 96,161