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INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits - January 1 $ 1,037
Gross increases - tax positions in prior period 120
Gross decreases - tax positions in prior period (1,157)
Unrecognized tax benefits - December 31