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FAIR VALUE MEASUREMENT - Narrative (Details) - Fourth Quarter Acquisitions, 2017 $ in Thousands | 6 Months Ended
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Jun. 30, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Contingent consideration related to 2017 acquisitions | $ 2,233
Contingent consideration, percent of contractual amount of acquisitions recognized | 51.00%

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