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Investments (Equity Securities) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]          
Equity security $ 12,711   $ 12,711   $ 14,844
Investment related gains (losses), net (5,016) $ 4,859 (5,598) $ 5,151  
Stock Mutual Funds [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Equity security 3,148   3,148   3,571
Bond Mutual Funds [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Equity security 4,407   4,407   5,060
Common stock [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Equity security 981   981   990
Non-redeemable Preferred Stock [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Equity security 11   11   161
Nonredeemable Preferred Stock Fund Member [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Equity security 4,164   4,164   $ 5,062
Equity Securities [Member]          
Debt and Equity Securities, FV-NI [Line Items]          
Investment related gains (losses), net $ (1,200) $ 300 $ (2,000) $ 600