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Income Taxes - Income Tax Benefit Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of unrecognized tax benefits |  |  |
Balance at January 1 | $ 1,919 | $ 1,606 | $ 1,510
Additions based on positions related to current period | 158 | 313 | 467
Reductions based on positions related to prior period | (1,410) | 0 | 0
Reductions due to lapse of statute of limitations | 0 | 0 | (371)
Balance at December 31 | $ 667 | $ 1,919 | $ 1,606

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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