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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Supplemental cash flow information    
Interest paid $ 52,490 $ 40,165
Income taxes paid 3,611 8,187
Changes in accounts payable related to purchases of revenue earning equipment 87,053 48,176
Operating and revenue earning equipment acquired under finance leases $ 2,026 $ 257