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