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ACQUISITIONS - Schedule of pro forma consolidated income statement (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
2021 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | $ 452,126,000 | $ 310,947,000 | $ 197,315,000 |
Net income | $ 13,511,000 | 18,480,000 | 14,475,000 |
2020 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  | 309,486,000 | 195,854,000 |
Net income |  | $ 18,308,000 | 14,302,000 |
2019 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue |  |  | 31,300,000 | $ 59,651,000
Net income |  |  | $ 4,751,000 | $ (2,088,000)

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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