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INTANGIBLE ASSETS - NARRATIVE (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of Intangible Assets $ 0.1 $ 0.1 $ 0.1