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INCOME TAXES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components of income tax expense:      
Current tax expense $ 836 $ 1,478 $ 1,035
Deferred tax expense 431 27 90
Amortization of tax benefit arising on intra-group transfers of non-current assets 0 0 (1,714)
Total income tax expense (benefit) $ 1,267 $ 1,505 $ (589)
Statutory tax rate 0.00% 0.00% 0.00%