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Income Taxes - Summary of Activity Related to Uncertain Tax Positions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of activity related to uncertain tax positions:      
Beginning Balance $ 3,699 $ 1,896 $ 1,701
Additions Based on Tax Positions Related to the Current Year 26 103 128
Additions for Tax Positions of Prior Years 220 1,957 595
Prior Year Reductions (108) (32) (85)
Statute Expirations (1,053) (225) (160)
Settlements (36) 0 (283)
Ending Balance $ 2,748 $ 3,699 $ 1,896