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GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Goodwill Roll Forward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Roll Forward]      
Goodwill balance at beginning of the year $ 39,244 $ 39,244 $ 31,591
Goodwill adjustments for purchase accounting 0 0 7,653
Goodwill adjustments for discontinued operations (2,100) 0 0
Goodwill balance at end of year   39,244 39,244
Goodwill 37,144 37,144  
Accumulated impairment losses at end of year $ 2,100 $ 0 $ 0