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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 |

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