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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, 2017 | Dec. 31, 2016
Assets: |  |
Assets | $ 27,492 | $ 7,923
Liabilities: |  |
Liabilities | 7,132 | 7,317
Cash and cash equivalents |  |
Assets: |  |
Money market funds | 25,214 | 5,703
Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 2,122 | 2,220
Interest rate swap | 156 |
Accrued and other long term liabilities |  |
Liabilities: |  |
Contingent consideration | 6,790 | 6,775
Other long-term liabilities |  |
Liabilities: |  |
Interest rate swap | 342 | 542
Level 1 |  |
Assets: |  |
Assets | 27,336 | 7,923
Level 1 | Cash and cash equivalents |  |
Assets: |  |
Money market funds | 25,214 | 5,703
Level 1 | Other long-term assets |  |
Assets: |  |
Equity, bond, and money market mutual funds held in trust related to the Voluntary Savings Plan | 2,122 | 2,220
Level 2 |  |
Assets: |  |
Assets | 156 |
Liabilities: |  |
Liabilities | 342 | 542
Level 2 | Other long-term assets |  |
Assets: |  |
Interest rate swap | 156 |
Level 2 | Other long-term liabilities |  |
Liabilities: |  |
Interest rate swap | 342 | 542
Level 3 |  |
Liabilities: |  |
Liabilities | $ 6,790 | $ 6,775
Level 3 | LDS |  |
Liabilities: |  |
Discount rate (as a percent) | 11.90% | 12.30%
Level 3 | Accrued and other long term liabilities |  |
Liabilities: |  |
Contingent consideration | $ 6,790 | $ 6,775

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