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GOODWILL | 9 Months Ended
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Sep. 30, 2021
GOODWILL [Abstract] |
GOODWILL | 6. GOODWILL The changes in the carrying amount of goodwill consisted of the following (in thousands):
|  | Nine Months Ended |  |  | Year Ended |
|  | September 30, 2021 |  |  | December 31, 2020 |
Beginning balance |  | $ | 345,646 |  |  | $ | 317,676 |
Goodwill acquired |  |  | 29,363 |  |  |  | 28,540 |
Goodwill derecognition (write-off) related to closed clinics |  |  | - |  |  |  | (1,859 | )
Goodwill adjustments for purchase price allocation of businesses acquired in prior year |  |  | (962 | ) |  |  | 1,289 |
Ending balance |  | $ | 374,047 |  |  | $ | 345,646 |
The derecognition (write-off) o f goodwill in the amount of $1.9 million during the year 2020 was related to certain clinics that have been permanently closed.

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- Definition The entire disclosure for goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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