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Income Taxes - Reconciliation of Unrecognized Tax Benefit (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits      
Balance at beginning of year $ 33,219 $ 40,878 $ 41,110
Additions based on tax positions related to the current year 6,881 4,398 7,708
Additions for tax positions of prior years 2,339 0 1,200
Reductions for tax positions of prior years 0 (2,410) 0
Reductions for audit settlements 0 (930) (3,205)
Reductions resulting from a lapse of the applicable statute of limitations periods (4,702) (8,717) (5,935)
Balance at end of year $ 37,737 $ 33,219 $ 40,878