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Investments (Equity Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Equity securities, at fair value | $ 11,710 |  | $ 11,710 |  | $ 11,590
Investment related gains (losses), net | 703 | $ (5,016) | 415 | $ (5,598) |
Stock Mutual Funds [Member] |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Equity securities, at fair value | 2,727 |  | 2,727 |  | 2,615
Bond Mutual Funds [Member] |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Equity securities, at fair value | 4,348 |  | 4,348 |  | 4,337
Common stock [Member] |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Equity securities, at fair value | 790 |  | 790 |  | 857
Non-redeemable Preferred Stock [Member] |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Equity securities, at fair value | 8 |  | 8 |  | 8
Nonredeemable Preferred Stock Fund Member [Member] |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Equity securities, at fair value | 3,837 |  | 3,837 |  | $ 3,773
Equity Securities [Member] |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Investment related gains (losses), net | $ (200) | $ (1,200) | $ 100 | $ (2,000) |

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