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Investments (Narrative) (Details) $ in Thousands | Jun. 30, 2020 USD ($) securities | Dec. 31, 2019 USD ($) securities
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Schedule of Investments [Line Items] |  |
Available-for-sale fixed maturity securities in unrealized loss position, number of positions | securities | 83 | 201
Available-for-sale securities, estimated fair value | $ 1,073,328 | $ 963,177
Available-for-sale securities, gross unrealized holding losses | $ (16,796) | $ (14,479)
Number of available-for-sale fixed maturity securities positions in a continuous unrealized loss position for one year or longer at period end | securities | 35 | 122
Available-for-sale securities, estimated fair value, 12 months or longer | $ 187,916 | $ 352,025
Available-for-sale securities, gross unrealized holding losses, 12 months or longer | (6,981) | (7,287)
Fixed Maturities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale securities, estimated fair value | 506,455 | 959,861
Available-for-sale securities, gross unrealized holding losses | (14,024) | (14,419)
Available-for-sale securities, estimated fair value, 12 months or longer | 187,916 | 352,025
Available-for-sale securities, gross unrealized holding losses, 12 months or longer | $ (6,981) | $ (7,287)

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