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Investments (Narrative) (Details) $ in Thousands	Jun. 30, 2023 USD ($) securities	Dec. 31, 2022 USD ($) securities
Schedule of Investments [Line Items]
Available-for-sale fixed maturity securities in unrealized loss position, number of positions | securities	1,603	1,400
Available-for-sale securities, estimated fair value	$ 13,229,776	$ 11,280,896
Available-for-sale securities, gross unrealized holding losses	$ (917,325)	$ (962,210)
Number of available-for-sale fixed maturity securities positions in a continuous unrealized loss position for one year or longer at period end | securities	991	246
Available-for-sale securities, estimated fair value, 12 months or longer	$ 8,111,873	$ 3,356,273
Available-for-sale securities, gross unrealized holding losses, 12 months or longer	(844,824)	(393,911)
Investments, available-for-sale, allowance for credit losses	$ 0	$ 0

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