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Income Taxes (Summary of Valuation Allowance) (Details) - Deferred Tax Valuation Allowance - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance as of January 1 | $ 26,488 | $ 26,581 | $ 111
Cost charged to the tax provision | 105 | 10 | 13
Reductions | 0 | (103) | (41)
Reclassification from discontinued operations upon sale of industrial group | 0 | 0 | 26,498
Balance as of December 31 | $ 26,593 | $ 26,488 | $ 26,581

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