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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (FV - Level 3) (Details) - Contingent Consideration
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Fair Value of liabilities level 3 hierarchy  
Balance beginning of period $ 6,970
Payments (3,528)
Change in fair value included in operating expenses 269
Balance at end of period $ 3,711