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ACQUISITIONS - Schedule of pro forma consolidated income statement (Details) - USD ($) $ / shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Revenue | $ 130,504 | $ 40,501 |  | $ 229,599 | $ 90,126 | $ 37,122
Net income | $ 12,446 | $ 1,849 |  | $ 19,849 | $ 2,352 |
Earnings (in dollars per share) |  |  |  |  |  | $ 1,465
Consolidated |  |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |  |
Revenue |  |  | $ 21,759 |  |  |
Earnings (in dollars per share) |  |  | $ 1,149 |  |  |

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