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GOODWILL (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Goodwill [Roll Forward]  
Beginning balance $ 226,806
Goodwill acquired during the period 17,586
Goodwill adjustments for purchase price allocation of business acquired 54
Goodwill written-off - closed clinics 0
Ending balance $ 244,446