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 |