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Investments (Schedule of components of net realized capital gain (loss) on investments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross realized gains | $ 18,130 | $ 9,740 | $ 4,652
Gross realized losses, excluding other-than-temporary impairment losses | (362) | (1,969) | (1,406)
Net realized gain on investments | 17,768 | 7,771 | 3,246
Change in net unrealized gain on equity securities | (2,289) | 5,853 | 11,537
Net capital gain on investments | 15,479 | 13,624 | 14,783
Fixed income securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross realized gains | 677 | 1,035 | 341
Gross realized losses, excluding other-than-temporary impairment losses | (27) | (132) | (147)
Equity securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross realized gains | 17,453 | 8,705 | 4,311
Gross realized losses, excluding other-than-temporary impairment losses | $ (335) | $ (1,837) | $ (1,259)

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