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Investments (Realized Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Debt Securities, Realized Gain (Loss) [Abstract]
Sales of fixed maturity securities, available-for-sale	$ 45,574	$ 0	$ 60,143	$ 4,659
Debt Securities, Available-for-sale, Realized Gain	868	0	960	91
Debt Securities, Available-for-sale, Realized Loss	75	0	517	196
Gain (Loss) on Securities [Line Items]
Investment related gains (losses), net	$ (1,255)	$ 827	(1,741)	$ 1,537
Discovery Communications LLC [Member]
Gain (Loss) on Securities [Line Items]
Investment related gains (losses), net			$ (400)

X

- Definition

Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of realized gain (loss) on investment.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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