Investments (Gains (Losses) on Equity Securities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Net losses during the period	$ (10,705)	$ (19,988)
Less: gains on securities sold during the period	0	357
Unrealized losses recognized during the period on short-term investments held at the reporting date, net	$ (10,705)	$ (20,345)