Investments in Fixed Maturity and Equity Securities - Investment in Equity Securities (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2026	Dec. 31, 2025
Debt and Equity Securities, FV-NI [Line Items]
Cost Basis	$ 1,244,076
Net Unrealized Gains (Losses)	19,445
Fair Value	1,263,521	$ 0
Communications
Debt and Equity Securities, FV-NI [Line Items]
Cost Basis	538,195
Net Unrealized Gains (Losses)	21,511
Fair Value	559,706
Consumer products
Debt and Equity Securities, FV-NI [Line Items]
Cost Basis	305,848
Net Unrealized Gains (Losses)	(9,825)
Fair Value	296,023
Financial
Debt and Equity Securities, FV-NI [Line Items]
Cost Basis	275,035
Net Unrealized Gains (Losses)	(22,653)
Fair Value	252,382
Technology
Debt and Equity Securities, FV-NI [Line Items]
Cost Basis	124,998
Net Unrealized Gains (Losses)	30,412
Fair Value	$ 155,410

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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+ Details

- Definition

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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