Investments (Gain (Loss) on Marketable Equity Securities) (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investments [Abstract]
Gain (loss) on marketable equity securities, net	$ 16,759	$ (54,250)	$ 113,429	$ (172,878)
Less: Net losses (gains) in earnings from marketable equity securities sold and donated	0	137	(5,475)	10,742
Net unrealized gains (losses) in earnings from marketable equity securities still held at the end of the period	$ 16,759	$ (54,113)	$ 107,954	$ (162,136)