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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES - Quantitative Information About Level 3 (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Fair Value, Inputs, Level 3 | Discounted cash flow | Annualized EBITDA and probability of achievement |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |
Contingent consideration: (ASI acquisition) | $ 4,319

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