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GOODWILL AND INTANGIBLE ASSETS - Schedule of Change in Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Roll Forward]      
Goodwill, Beginning Balance $ 719 $ 719 $ 0
Acquired goodwill 11,873 0 719
Goodwill, Ending Balance $ 12,592 $ 719 $ 719