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INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
INCOME TAXES    
Balance as of January 1 $ 4,637 $ 5,758
Additions for tax positions related to current years 0 157
Additions (deductions) for tax positions related to prior years 96 (1,113)
Deductions for tax positions as a result of tax settlements 0 (165)
Balance as of December 31 $ 4,733 $ 4,637