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INCOME TAXES - Changes in Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of the changes in unrecognized tax benefits      
Balance at beginning of year $ 11,008 $ 9,716 $ 11,058
Additions for tax positions taken during current year 2,952 1,292 1,787
Reduction to prior year tax position 0 0 (3,129)
Balance at end of year $ 13,960 $ 11,008 $ 9,716