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GOODWILL (Tables)
9 Months Ended
Sep. 30, 2018
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
September 30, 2018
        
Year Ended
December 31, 2017
    
Beginning balance
 
$
271,338
  
$
226,806
 
Goodwill acquired during the year
  
19,488
   
44,292
 
Goodwill adjustments for purchase price allocation of businesses acquired in prior year
  
2,804
   
706
 
Goodwill written-off - closed clinic
  
-
   
(466
)
Ending balance
 
$
293,630
  
$
271,338