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Investments (Narrative) (Details) $ in Thousands	Sep. 30, 2025 USD ($) securities	Dec. 31, 2024 USD ($) securities
Schedule of Investments [Line Items]
Available-for-sale fixed maturity securities in unrealized loss position, number of positions | securities	950	1,485
Available-for-sale securities, estimated fair value	$ 8,013,271	$ 12,570,401
Available-for-sale securities, gross unrealized holding losses	$ (361,101)	$ (743,003)
Number of available-for-sale fixed maturity securities positions in a continuous unrealized loss position for one year or longer at period end | securities	849	966
Available-for-sale securities, estimated fair value, 12 months or longer	$ 6,627,517	$ 7,448,033
Available-for-sale securities, gross unrealized holding losses, 12 months or longer	(353,511)	(633,124)
Investments, available-for-sale, allowance for credit losses	$ 0	$ 0

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