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INCOME TAX (EXPENSE) CREDIT - Component (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
INCOME TAX (EXPENSE) CREDIT      
Current tax $ (15,299) $ (4,906) $ (10,976)
Deferred tax 8,014 11,436 9,699
Total income tax (expense) credit $ (7,285) $ 6,530 $ (1,277)