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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details 3) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Interest rate swap agreement | Other long-term liabilities |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Liabilities | $ 800 | $ 600
Recurring basis | Level 1 |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Assets | 40,694 | 44,069
Recurring basis | Level 1 | Money market funds | Cash and cash equivalents |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Assets | 38,603 | 41,101
Recurring basis | Level 1 | Voluntary Savings Plan - mutual funds held in trust | Other long-term assets |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Assets | 2,091 | 2,968
Recurring basis | Level 2 | Interest rate swap agreement | Other long-term liabilities |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Liabilities | $ 773 | $ 576

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