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GOODWILL (Tables)
3 Months Ended
Mar. 31, 2018
GOODWILL [Abstract]  
Summary of Changes in Carrying Amount of Goodwill
The changes in the carrying amount of goodwill consisted of the following (in thousands):

Beginning balance
 
$
271,338
 
Goodwill acquired during the year
  
856
 
Goodwill adjustments for purchase price allocation of businesses acquired in prior year
  
1,576
 
Ending balance
 
$
273,770