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FAIR VALUE MEASUREMENTS - Level 3 (Details) - Recurring - Level 3 - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Beginning balance | $ 23,399 | $ 32,976 | $ 25,156 | $ 35,744
New acquisitions | 1,574 | 1,906 | 2,750 | 3,973
Payouts | (2,145) | (7,947) | (5,196) | (12,873)
Interest on outstanding contingencies | 122 | 258 | 247 | 537
Charge offset, forfeit and other | (208) | (136) | (215) | (324)
Ending balance | $ 22,742 | $ 27,057 | $ 22,742 | $ 27,057

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