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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract] |
Supplemental cash flow information | Supplemental cash flow information was as follows:
|  | Years ended December 31,
|  | 2015 |  | 2014 |  | 2013
|  | (In thousands)
Interest paid |  | $ | 144,973 |  |  | 139,595 |  |  | 132,946 |
Income taxes paid |  | 13,379 |  |  | 11,382 |  |  | 13,063 |
Changes in accounts payable related to purchases of revenue earning equipment |  | 28,134 |  |  | 39,071 |  |  | 43,745 |
Operating and revenue earning equipment acquired under capital leases |  | 5,959 |  |  | 7,972 |  |  | 5,698 |

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