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BUSINESS COMBINATIONS - 2019 Acquisitions (Details) - USD ($) $ in Thousands |  |  | 9 Months Ended
--- | --- | --- | ---
May 31, 2019 | Mar. 01, 2019 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |
Goodwill recognized |  |  | $ 12,739
Private Held Company |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price | $ 14,900 | $ 10,400 |
Goodwill recognized | $ 7,500 | $ 5,200 |

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