Policyholders' Liabilities (Reconciliation to Liability for Future Policy Benefits) (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefit liability	$ 1,182,592	$ 1,189,427	$ 1,171,356
International Insurance, Permanent
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	654,641		667,322
Domestic Insurance, Life Insurance, Permanent
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	131,026		124,474
Permanent
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	785,667		791,796
International Insurance, Permanent Limited Pay
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	143,403		142,469
Domestic Insurance, Life Insurance, Permanent Limited Pay
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	126,068		125,119
Permanent Limited Pay
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	269,471		267,588
International Insurance, Deferred Profit Liability
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	28,235		25,466
Domestic Insurance, Life Insurance, Deferred Profit Liability
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	39,881		37,192
Deferred Profit Liability
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	68,116		62,658
International Insurance, Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	31,761		30,827
Domestic Insurance, Life Insurance, Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	26,068		17,247
Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	57,829		48,074
International Insurance, Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	858,040		866,084
Domestic Insurance, Life Insurance
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	323,043		304,032
Life Insurance Product Line
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefit liability	1,181,083	1,188,089	1,170,116
International Insurance, Accident And Health, Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	796		631
Domestic Insurance, Accident And Health, Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	713		609
Accident and Health Insurance Product Line
Liability for Future Policy Benefit, by Product Segment [Line Items]
Future policy benefit liability	1,509	$ 1,338	1,240
International Insurance And Accident And Health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	858,836		866,715
Domestic Insurance, Life Insurance And Accident And Health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability For Future Policy Benefit, Current Discount Rate, Before Reinsurance	$ 323,756		$ 304,641