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INCOME TAXES - Deferred Income Tax Classification (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Long-term deferred tax assets, net $ 4,239 $ 5,368
Long-term deferred tax liabilities 1,147 29
Net deferred tax assets $ 3,092 $ 5,339