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Investments (Schedule of components of net realized capital gain (loss) on investments) (Details) - USD ($)
$ in Thousands
12 Months Ended
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)