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INCOME TAXES - Reconciliation of Beginning and Ending Balances of Gross Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of period $ 23,271 $ 18,157 $ 19,150
Additions for tax positions related to the current year 653 510 978
Additions for tax positions of prior years 962 4,917 174
Reductions for tax positions of prior years (1,085) (313) (2,145)
Balance at end of period $ 23,801 $ 23,271 $ 18,157