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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Assets and Liabilities) (Details) - Recurring basis - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Assets: |  |
Assets | $ 41,330 | $ 17,358
Cash and cash equivalents |  |
Assets: |  |
Money market funds | 37,342 | 14,518
Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 2,453 | 2,359
Interest rate swaps | 1,535 | 481
Accrued and other long term liabilities |  |
Liabilities: |  |
Contingent consideration | 4,092 | 6,970
Level 1 |  |
Assets: |  |
Assets | 39,795 | 16,877
Level 1 | Cash and cash equivalents |  |
Assets: |  |
Money market funds | 37,342 | 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 | 2,453 | 2,359
Level 2 |  |
Assets: |  |
Assets | 1,535 | 481
Level 2 | Other long-term assets |  |
Assets: |  |
Interest rate swaps | 1,535 | 481
Level 3 | Accrued and other long term liabilities |  |
Liabilities: |  |
Contingent consideration | $ 4,092 | $ 6,970
Level 3 | Accrued and other long term liabilities | LDS |  |
Liabilities: |  |
Discount rate (as a percent) | 12.00% | 12.50%

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