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FAIR VALUE MEASUREMENT - Narrative (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($)
Fourth Quarter Acquisitions, 2017 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Contingent consideration related to 2017 and 2018 acquisitions | $ 2,233
Contingent consideration, percent of contractual amount of acquisitions recognized | 51.00%
Third Quarter Acquisitions, 2018 [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Contingent consideration related to 2017 and 2018 acquisitions | $ 4,500
Contingent consideration, percent of contractual amount of acquisitions recognized | 100.00%

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