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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Assets Sec) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Arrangements |  |  |
Total assets securing notes payable or held under capital leases | $ 222,367 | $ 138,492 |
Less accumulated depreciation and amortization | 61,643 | 25,120 |
Net assets securing notes payable or held under capital leases | $ 160,724 | 113,372 |
Weighted-average interest rate (as a percent) | 2.30% |  |
Interest paid, net of capitalized interest | $ 4,500 | 4,000 | $ 2,700
Capitalized interest | 700 | 200 | $ 100
Revenue equipment |  |  |
Financing Arrangements |  |  |
Total assets securing notes payable or held under capital leases | 220,566 | 136,698 |
Land and structures (terminals) |  |  |
Financing Arrangements |  |  |
Total assets securing notes payable or held under capital leases | 1,794 | $ 1,794 |
Other equipment |  |  |
Financing Arrangements |  |  |
Total assets securing notes payable or held under capital leases | $ 7 |  |

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