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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Supplemental cash flow information    
Interest paid $ 34,421 $ 38,381
Income taxes paid 4,750 3,590
Changes in accounts payable related to purchases of revenue earning equipment $ (77,486) $ 99,972