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Investments Investments (Rollforward of Allowance for Credit Losses) (Details) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance (1) | [1] | $ 28,332 |
Additions for credit losses not previously recorded |  | 25,041 | $ 56,412
Reduction for securities with credit losses due to intent to sell |  | (3,187) | (6,226)
Ending balance |  | 50,186 | 50,186
Corporate Securities |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance (1) | [1] | 28,332 |
Additions for credit losses not previously recorded |  | 18,417 | 46,749
Reduction for securities with credit losses due to intent to sell |  | 0 | 0
Ending balance |  | 46,749 | 46,749
Commercial Mortgage Backed Securities |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance (1) | [1] | 0 |
Additions for credit losses not previously recorded |  | 5,847 | 8,338
Reduction for securities with credit losses due to intent to sell |  | (3,187) | (5,678)
Ending balance |  | 2,660 | 2,660
Residential Mortgage Backed Securities |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance (1) | [1] | 0 |
Additions for credit losses not previously recorded |  | 777 | 777
Reduction for securities with credit losses due to intent to sell |  | 0 | 0
Ending balance |  | 777 | 777
Other Asset Backed Securities |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance (1) | [1] | 0 |
Additions for credit losses not previously recorded |  | 0 | 548
Reduction for securities with credit losses due to intent to sell |  | 0 | (548)
Ending balance |  | $ 0 | $ 0
[1] | (1) The allowance for credit loss associated with available for sale fixed maturity securities was applied prospectively upon adoption of authoritative guidance effective January 1, 2020. See Note 1 for further details.

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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=118955579&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=118955579&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=118939692&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=118942338&loc=SL82898722-210454 + Details
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- Definition Amount of expense 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), for which no credit loss was previously recorded. + 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 (b) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455 + Details
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- Definition Amount of decrease in 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) from intent to sell or more likely than not will be required to sell before recovery of amortized cost basis. + 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 (e) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455 + Details
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