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Investments (Rollforward of Allowance for Credit Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | $ 59,698 | $ 28,332 | $ 64,771 | $ 0
Additions for credit losses not previously recorded | 0 | 25,041 | 816 | 56,412
Change in allowance on securities with previous allowance | 176 |  | 797 |
Reduction for securities sold during the period | (44,248) |  | (50,758) |
Recoveries of amounts previously written off | (1,436) |  | (1,436) |
Reduction for securities with credit losses due to intent to sell |  | (3,187) |  | (6,226)
Ending balance | 14,190 | 50,186 | 14,190 | 50,186
United States Municipalities, States and Territories |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | 2,791 | 0 | 2,844 | 0
Additions for credit losses not previously recorded | 0 | 0 | 0 | 0
Change in allowance on securities with previous allowance | 556 |  | 503 |
Reduction for securities sold during the period | 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 | 3,347 | 0 | 3,347 | 0
Corporate Securities |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | 55,715 | 28,332 | 60,193 | 0
Additions for credit losses not previously recorded | 0 | 18,417 | 705 | 46,749
Change in allowance on securities with previous allowance | (402) |  | 925 |
Reduction for securities sold during the period | (44,248) |  | (50,758) |
Recoveries of amounts previously written off | (342) |  | (342) |
Reduction for securities with credit losses due to intent to sell |  | 0 |  | 0
Ending balance | 10,723 | 46,749 | 10,723 | 46,749
Commercial Mortgage 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 | 5,847 | 0 | 8,338
Change in allowance on securities with previous allowance | 0 |  | 0 |
Reduction for securities sold during the period | 0 |  | 0 |
Recoveries of amounts previously written off | 0 |  | 0 |
Reduction for securities with credit losses due to intent to sell |  | (3,187) |  | (5,678)
Ending balance | 0 | 2,660 | 0 | 2,660
Residential Mortgage Backed Securities |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Beginning balance | 1,192 | 0 | 1,734 | 0
Additions for credit losses not previously recorded | 0 | 777 | 111 | 777
Change in allowance on securities with previous allowance | 22 |  | (631) |
Reduction for securities sold during the period | 0 |  | 0 |
Recoveries of amounts previously written off | (1,094) |  | (1,094) |
Reduction for securities with credit losses due to intent to sell |  | 0 |  | 0
Ending balance | 120 | 777 | 120 | 777
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 |
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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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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