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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (FV) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Interest rate swap agreement | Other long-term liabilities |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Liabilities | $ 1,800 | $ 900
Recurring basis | Level 1 |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Assets | 29,143 | 27,031
Recurring basis | Level 1 | Money market funds | Cash and cash equivalents |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Assets | 27,105 | 24,904
Recurring basis | Level 1 | Voluntary Savings Plan - mutual funds held in trust |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Assets | 2,038 | 2,127
Recurring basis | Level 2 | Interest rate swap agreement | Other long-term liabilities |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Liabilities | $ 1,796 | $ 897

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