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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Assets Sec) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Arrangements |  |  |
Total assets securing notes payable or held under finance leases | $ 293,799 | $ 273,615 |
Less accumulated depreciation and amortization | 71,405 | 79,961 |
Net assets securing notes payable or held under finance leases | $ 222,394 | 193,654 |
Weighted-average interest rate (as a percent) | 3.10% |  |
Interest paid, net of capitalized interest | $ 10,900 | 8,700 | $ 5,800
Capitalized interest | 200 | 200 | $ 900
Revenue equipment |  |  |
Financing Arrangements |  |  |
Total assets securing notes payable or held under finance leases | 265,315 | 264,396 |
Land and structures (service centers) |  |  |
Financing Arrangements |  |  |
Total assets securing notes payable or held under finance leases |  | 1,794 |
Software |  |  |
Financing Arrangements |  |  |
Total assets securing notes payable or held under finance leases | 2,140 | 1,484 |
Service, office, and other equipment |  |  |
Financing Arrangements |  |  |
Total assets securing notes payable or held under finance leases | $ 26,344 | $ 5,941 |

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