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GOODWILL (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Goodwill [Roll Forward] |  |  |  |  |
Beginning balance |  |  | $ 317,676 | $ 293,525 | $ 293,525
Goodwill acquired |  |  | 19,824 |  | 31,330
Goodwill related to partnership interest sold |  |  | 0 |  | (7,325)
Goodwill write-off related to closed clinics | $ 0 | $ 0 | (1,859) | $ 0 | 0
Goodwill adjustments for purchase price allocation of businesses acquired in prior year |  |  | 1,305 |  | 146
Ending balance | $ 336,946 |  | $ 336,946 |  | $ 317,676

X
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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