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GOODWILL (Tables)
9 Months Ended
Sep. 30, 2021
GOODWILL [Abstract]  
Changes in Carrying Amount of 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