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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 |

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