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Net Investment Gains (Losses) (Net Investment Gains (Losses)) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract] |  |
Fixed maturity securities, gains | $ 1,705 | $ 8,240
Fixed maturity securities, losses | (2,984) | (2,071)
Net realized gains on investment sales | 905 | 8,572
Change in unrealized gains (losses) | 93,213 | (24,335)
Investment funds | (2,162) | 47,671
Real estate (2) | 286,192 | 12,909
Loans receivable | (32) | 0
Other | (6,955) | 773
Net realized and unrealized gains on investments in earnings before allowance for expected credit losses | 369,882 | 51,759
Fixed maturity securities | (3,906) | (18,159)
Loans receivable | 289 | 1,239
Change in allowance for expected credit losses on investments | (3,617) | (16,920)
Net investment gains | 366,265 | 34,839
Income tax expense | (78,442) | (5,887)
After-tax net investment gains | $ 287,823 | $ 28,952

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