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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]    
Interest paid $ 104,829 $ 72,051
Income taxes paid 10,782 15,109
Changes in accounts payable related to purchases of revenue earning equipment 37,744 75,312
Operating and revenue earning equipment acquired under finance leases $ 6,633 $ 9,906