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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract] |
Supplemental cash flow information | Supplemental cash flow information was as follows:
|  | Years ended December 31,
|  | 2017 |  | 2016 |  | 2015
|  | (In thousands)
Interest paid |  | $ | 129,559 |  |  | 143,990 |  |  | 144,973 |
Income taxes paid |  | 13,692 |  |  | 14,062 |  |  | 13,379 |
Changes in accounts payable related to purchases of revenue earning equipment |  | 80,781 |  |  | (142,256 | ) |  | 28,134 |
Operating and revenue earning equipment acquired under capital leases |  | 7,057 |  |  | 1,230 |  |  | 5,959 |

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