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Income Taxes Income Taxes - Unrecognized Tax Benefit Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of the unrecognized tax benefit      
Beginning balance $ 18,453 $ 19,560 $ 21,400
Additions based on tax positions related to current year 2,397 2,227 1,893
Additions based on tax positions related to prior years   2,047 450
Reductions based on settlement refunds from government authorities   (4,414) (3,461)
Reductions based on tax positions related to prior years (73) (51) (20)
Reductions based on lapse of statute of limitations (1,885) (916) (702)
Ending balance $ 18,892 $ 18,453 $ 19,560