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Investments (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) Securities | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) Securities | Dec. 31, 2019 USD ($) Securities | Dec. 31, 2018 USD ($)
Investments [Abstract] |  |  |  |  |  |  |
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations | 98.00% |  |  |  | 97.00% | 98.00% |
Number of securities in unrealized loss position | Securities | 1,033 |  |  |  | 843 | 1,033 |
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade | 79.00% |  |  |  | 75.00% | 79.00% |
Proceeds from sales of available for sale fixed maturity securities |  |  |  |  | $ 5,400,000 | $ 1,000,000 | $ 2,500,000
Principal repayments, calls and tenders of available for sale fixed maturity securities |  |  |  |  | 2,900,000 | 2,300,000 | 1,400,000
Net OTTI losses recognized in operations | $ (17,412) | $ (101) | $ (1,213) | $ 0 | 0 | (18,726) | $ (36,656)
Assets on deposit with state agencies to meet regulatory requirements | 51,600,000 |  |  |  | 53,500,000 | 51,600,000 |
Fair value, concentration of risk, investments | $ 0 |  |  |  | $ 0 | $ 0 |

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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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