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Investments (Narrative) (Details) $ in Thousands	Mar. 31, 2024 USD ($) securities	Dec. 31, 2023 USD ($) securities
Schedule of Investments [Line Items]
Available-for-sale fixed maturity securities in unrealized loss position, number of positions | securities	1,578	1,386
Available-for-sale securities, estimated fair value	$ 14,054,632	$ 9,982,329
Available-for-sale securities, gross unrealized holding losses	$ (750,334)	$ (661,282)
Number of available-for-sale fixed maturity securities positions in a continuous unrealized loss position for one year or longer at period end | securities	1,126	1,131
Available-for-sale securities, estimated fair value, 12 months or longer	$ 8,290,674	$ 8,515,061
Available-for-sale securities, gross unrealized holding losses, 12 months or longer	(717,115)	(650,461)
Investments, available-for-sale, allowance for credit losses	$ 0	$ 0

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