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GOODWILL (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Goodwill [Roll Forward]    
Beginning balance $ 293,525 $ 271,338
Goodwill acquired 30,293 19,778
Goodwill related to partnership interest sold (7,325) 0
Goodwill adjustments for purchase price allocation of businesses acquired in prior year 146 2,409
Ending balance $ 316,639 $ 293,525