Segment Information - Schedule of Reconciles Segment Revenues to Total Revenues and Segment Income (Loss) Before Income Taxes to Income (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Revenues	$ 872,693	$ 804,843
Income before income taxes	249,418	221,315
Term Life Insurance Segment [Member]
Segment Reporting Information [Line Items]
Revenues	464,634	457,841
Income before income taxes	154,860	146,785
Investment and Savings Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	350,645	290,812
Income before income taxes	100,899	81,271
Corporate and Other Distributed Products Segment [Member]
Segment Reporting Information [Line Items]
Revenues	57,414	56,190
Income before income taxes	$ (6,341)	$ (6,741)

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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