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FAIR VALUE (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Other long-term assets | $ 4,708 | $ 5,038
Recurring basis | Level 1 |  |
Assets |  |
Pension plan assets | 5,603 | 5,231
Other long-term assets | 4,340 | 3,962
Recurring basis | Level 2 |  |
Assets |  |
Interest rate swaps | $ 223 | $ 434

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