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Supplemental Reinsurance Premiums (Schedule of Property and Liability Insurance Earned Premiums) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Direct amounts |  |  |  |  |  |  |  |  | $ 3,603,780 | $ 3,655,233 | $ 3,416,687
Ceded to other companies |  |  |  |  |  |  |  |  | (56,212) | (56,725) | (48,941)
Assumed |  |  |  |  |  |  |  |  | 8,067 | 910 | 665
Net amounts | $ 921,860 | $ 899,304 | $ 811,897 | $ 922,574 | $ 925,384 | $ 915,012 | $ 888,776 | $ 870,245 | $ 3,555,635 | $ 3,599,418 | $ 3,368,411

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