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Investments (Narrative) (Details) $ in Thousands	Jun. 30, 2020 USD ($) securities	Dec. 31, 2019 USD ($) securities
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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