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GOODWILL (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Goodwill [Roll Forward]  
Beginning balance $ 147,914
Goodwill acquired during the period 22,731
Goodwill adjustments for business acquired in 2014 384
Goodwill written-off - closed clinic (180)
Ending balance $ 170,849