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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Balance at beginning of year $ 3,242 $ 3,612
Additions for tax positions of current year 15 13
Additions for tax positions of prior years 1,413 121
Reductions for tax positions of prior year 0 (29)
Lapse of statute of limitations (984) (475)
Balance at end of year $ 3,686 $ 3,242