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INCOME TAXES - Components of Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Current tax expense $ (19,327) $ (23,324) $ (14,053)
Deferred tax gain 4,310 7,456 5,972
TOTAL INCOME TAX EXPENSE $ (15,017) $ (15,868) (8,081)
Changes in tax rates or tax laws enacted or announced      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax gain     $ 1,004