Investments (Equity Securities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Equity security	$ 13,902		$ 14,844
Investment related gains (losses), net	(582)	$ 292
Stock Mutual Funds [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity security	3,476		3,571
Bond Mutual Funds [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity security	4,880		5,060
Common stock [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity security	957		990
Non-redeemable Preferred Stock [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity security	10		161
Nonredeemable Preferred Stock Fund Member [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity security	4,579		$ 5,062
Equity Securities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Investment related gains (losses), net	$ (800)	$ 300