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INCOME TAXES - Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Income taxes at statutory rate $ 0 $ 0 $ 0
Effect of deferred tax benefit on intra-group transfers of non-current assets 0 0 (1,714)
Effect of movement in deferred tax balances 431 27 90
Effect of adjustments in respect of current tax in prior periods (369) (5) (334)
Effect of taxable income in various countries 1,205 1,483 1,369
Total income tax expense (benefit) $ 1,267 $ 1,505 $ (589)