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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES - Quantitative Information About Level 3 (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Fair Value, Inputs, Level 3 | Valuation Technique, Discounted Cash Flow | Annualized EBITDA and probability of achievement  
Fair Value Measurement Inputs and Valuation Techniques [Abstract]  
Contingent consideration: (ASI acquisition) $ 4,084