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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Assets Sec) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Arrangements |  |  |
Total assets securing notes payable or held under capital leases | $ 272,330 | $ 222,367 |
Less accumulated depreciation and amortization | 87,691 | 61,643 |
Net assets securing notes payable or held under capital leases | $ 184,639 | 160,724 |
Weighted-average interest rate (as a percent) | 2.80% |  |
Interest paid, net of capitalized interest | $ 5,800 | 4,500 | $ 4,000
Capitalized interest | 900 | 700 | $ 200
Revenue equipment |  |  |
Financing Arrangements |  |  |
Total assets securing notes payable or held under capital leases | 269,950 | 220,566 |
Land and structures (service centers) |  |  |
Financing Arrangements |  |  |
Total assets securing notes payable or held under capital leases | 1,794 | 1,794 |
Software |  |  |
Financing Arrangements |  |  |
Total assets securing notes payable or held under capital leases | 486 |  |
Service, office, and other equipment |  |  |
Financing Arrangements |  |  |
Total assets securing notes payable or held under capital leases | $ 100 | $ 7 |

X
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