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Leases (Tables) | 12 Months Ended
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Dec. 31, 2016
Minimum Lease Payments | The future minimum lease payments under all noncancelable leases at December 31, 2016, principally for trailing equipment, are shown in the following table (in thousands):
|  | Capital Leases |  |  | Operating Leases |
2017 |  | $ | 47,860 |  |  | $ | 634 |
2018 |  |  | 37,654 |  |  |  | 424 |
2019 |  |  | 29,431 |  |  |  | 123 |
2020 |  |  | 22,054 |  |  |  | 53 |
2021 |  |  | 7,572 |  |  |  | 53 |
Thereafter |  |  | — |  |  |  | 264 |
Total future minimum lease payments |  |  | 144,571 |  |  | $ | 1,551 |
Less amount representing interest (2.0% to 3.1%) |  |  | 6,267 |  |  |  |  |
Present value of minimum lease payments |  | $ | 138,304 |  |  |  |  |

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- Definition Schedule Of Future Minimum Lease Payments For Non Cancelable Leases [Table Text Block] + References No definition available. + Details
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