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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Supplemental cash flow information    
Interest paid $ 40,165 $ 31,441
Income taxes paid 8,187 3,107
Changes in accounts payable related to purchases of revenue earning equipment 48,176 74,766
Operating and revenue earning equipment acquired under capital leases 257 1,607
Changes in restricted cash $ 1,327 $ (1,435)