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Investments (Rollforward of Allowance for Credit Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | $ 14,190 | $ 50,186 | $ 64,771 | $ 0
Additions for credit losses not previously recorded | 296 | 25,923 | 1,112 | 82,335
Change in allowance on securities with previous allowance | (260) |  | 537 |
Reduction for securities sold during the period | 0 |  | (50,758) |
Write-offs charged against the allowance | (10,032) |  | (10,032) |
Recoveries of amounts previously written off | (120) |  | (1,556) |
Reduction for securities with credit losses due to intent to sell |  | (14,490) |  | (20,716)
Ending balance | 4,074 | 61,619 | 4,074 | 61,619
United States Municipalities, States and Territories |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | 3,347 | 0 | 2,844 | 0
Additions for credit losses not previously recorded | 0 | 0 | 0 | 0
Change in allowance on securities with previous allowance | (575) |  | (72) |
Reduction for securities sold during the period | 0 |  | 0 |
Write-offs charged against the allowance | 0 |  | 0 |
Recoveries of amounts previously written off | 0 |  | 0 |
Reduction for securities with credit losses due to intent to sell |  | 0 |  | 0
Ending balance | 2,772 | 0 | 2,772 | 0
Corporate Securities |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | 10,723 | 46,749 | 60,193 | 0
Additions for credit losses not previously recorded | 0 | 6,296 | 705 | 53,045
Change in allowance on securities with previous allowance | 315 |  | 1,240 |
Reduction for securities sold during the period | 0 |  | (50,758) |
Write-offs charged against the allowance | (10,032) |  | (10,032) |
Recoveries of amounts previously written off | 0 |  | (342) |
Reduction for securities with credit losses due to intent to sell |  | 0 |  | 0
Ending balance | 1,006 | 53,045 | 1,006 | 53,045
Commercial Mortgage Backed Securities |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | 0 | 2,660 | 0 | 0
Additions for credit losses not previously recorded | 0 | 19,183 | 0 | 27,521
Change in allowance on securities with previous allowance | 0 |  | 0 |
Reduction for securities sold during the period | 0 |  | 0 |
Write-offs charged against the allowance | 0 |  | 0 |
Recoveries of amounts previously written off | 0 |  | 0 |
Reduction for securities with credit losses due to intent to sell |  | (14,490) |  | (20,168)
Ending balance | 0 | 7,353 | 0 | 7,353
Residential Mortgage Backed Securities |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | 120 | 777 | 1,734 | 0
Additions for credit losses not previously recorded | 296 | 444 | 407 | 1,221
Change in allowance on securities with previous allowance | 0 |  | (631) |
Reduction for securities sold during the period | 0 |  | 0 |
Write-offs charged against the allowance | 0 |  | 0 |
Recoveries of amounts previously written off | (120) |  | (1,214) |
Reduction for securities with credit losses due to intent to sell |  | 0 |  | 0
Ending balance | 296 | 1,221 | 296 | 1,221
Other Asset Backed Securities |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | 0 | 0 | 0 | 0
Additions for credit losses not previously recorded | 0 | 0 | 0 | 548
Change in allowance on securities with previous allowance | 0 |  | 0 |
Reduction for securities sold during the period | 0 |  | 0 |
Write-offs charged against the allowance | 0 |  | 0 |
Recoveries of amounts previously written off | 0 |  | 0 |
Reduction for securities with credit losses due to intent to sell |  | 0 |  | (548)
Ending balance | $ 0 | $ 0 | $ 0 | $ 0

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