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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (FV - Level 3) (Details) - Contingent Consideration - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value of liabilities level 3 hierarchy    
Balance beginning of period $ 6,970 $ 6,775
Payments (3,528)  
Change in fair value included in operating expenses 1,030 195
Balance at end of period $ 4,472 $ 6,970