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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Assets and Liabilities) (Details) $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) item
--- | --- | ---
Level 3 | Discount Rate |  |
Liabilities: |  |
Measurement input | item |  | 0.125
Recurring basis |  |
Assets: |  |
Assets | $ 45,613 | $ 17,358
Recurring basis | Cash and cash equivalents |  |
Assets: |  |
Money market funds | 42,470 | 14,518
Recurring basis | Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 2,342 | 2,359
Interest rate swaps | 801 | 481
Recurring basis | Accrued and other long term liabilities |  |
Liabilities: |  |
Contingent consideration | 4,472 | 6,970
Recurring basis | Level 1 |  |
Assets: |  |
Assets | 44,812 | 16,877
Recurring basis | Level 1 | Cash and cash equivalents |  |
Assets: |  |
Money market funds | 42,470 | 14,518
Recurring basis | Level 1 | Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 2,342 | 2,359
Recurring basis | Level 2 |  |
Assets: |  |
Assets | 801 | 481
Recurring basis | Level 2 | Other long-term assets |  |
Assets: |  |
Interest rate swaps | 801 | 481
Recurring basis | Level 3 | Accrued and other long term liabilities |  |
Liabilities: |  |
Contingent consideration | $ 4,472 | $ 6,970

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