Investments (Equity Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	$ 11,789		$ 11,789		$ 14,844
Investment related gains (losses), net	(4,991)	$ 2,126	(10,589)	$ 7,277
Stock Mutual Funds [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	2,865		2,865		3,571
Bond Mutual Funds [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	4,136		4,136		5,060
Common stock [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	769		769		990
Non-redeemable Preferred Stock [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	10		10		161
Nonredeemable Preferred Stock Fund Member [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity securities, at fair value	4,009		4,009		$ 5,062
Equity Securities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Investment related gains (losses), net	$ (900)	$ (400)	$ (2,900)	$ 200