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GOODWILL (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Goodwill [Roll Forward]      
Beginning balance $ 345,646 $ 317,676 $ 317,676
Goodwill acquired 14,416   28,540
Goodwill derecognition (write-off) related to closed clinics 0 $ (1,859) (1,859)
Goodwill adjustments for purchase price allocation of businesses acquired in prior year 114   1,289
Ending balance $ 360,176   $ 345,646