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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Assets and Liabilities) (Details) - Recurring basis $ in Thousands | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) item
--- | --- | ---
Assets: |  |
Assets | $ 37,238 | $ 17,358
Cash and cash equivalents |  |
Assets: |  |
Money market funds | 32,849 | 14,518
Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 2,628 | 2,359
Interest rate swaps | 1,761 | 481
Liabilities: |  |
Fair value of interest rate swap, asset | 1,761 | 481
Accrued and other long term liabilities |  |
Liabilities: |  |
Contingent consideration | 4,472 | 6,970
Level 1 |  |
Assets: |  |
Assets | 35,477 | 16,877
Level 1 | Cash and cash equivalents |  |
Assets: |  |
Money market funds | 32,849 | 14,518
Level 1 | Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 2,628 | 2,359
Level 2 |  |
Assets: |  |
Assets | 1,761 | 481
Level 2 | Other long-term assets |  |
Assets: |  |
Interest rate swaps | 1,761 | 481
Liabilities: |  |
Fair value of interest rate swap, asset | 1,761 | 481
Level 3 | Accrued and other long term liabilities |  |
Liabilities: |  |
Contingent consideration | $ 4,472 | $ 6,970
Level 3 | Accrued and other long term liabilities | LDS | Discount Rate |  |
Liabilities: |  |
Measurement input | item |  | 0.125

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