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Investments (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) Securities | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) Securities | Jun. 30, 2019 USD ($) | Dec. 31, 2019 Securities
Investments [Abstract] |  |  |  |  |
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations | 97.00% |  | 97.00% |  | 98.00%
Number of securities in unrealized loss position | Securities | 1,613 |  | 1,613 |  | 1,033
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade | 80.00% |  | 80.00% |  | 79.00%
Proceeds from sales of available for sale fixed maturity securities |  |  | $ 973,400 | $ 359,300 |
Principal repayments, calls and tenders for available for sale fixed maturity securities |  |  | 1,400,000 | 500,500 |
Other than temporary impairment losses | $ 0 | $ 1,213 | $ 0 | $ 1,213 |

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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 + Details
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