Loss And Loss Adjustment Expense Reserves (Schedule Of Losses And Loss Adjustment Expenses, Additional Disclosure) (Details) - Fire - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2025	Mar. 31, 2025	Jun. 30, 2025	Sep. 30, 2025
Unusual or Infrequent Item, or Both [Line Items]
Subrogation recovered and recoverable - Eaton fire		$ (525,000)	$ (528,000)	$ (526,654)
Average payout percentage by utility companies	60.00%			60.00%
Negotiated payout percentage by utility companies	52.00%			52.00%
Subrogation recovered and recoverable - Palisades fire		0	(46,500)	$ (47,758)
Subrogation recovered and recoverable - Palisades fire, amount received				27,000
Subrogation recovered and recoverable - Palisades fire, remaining balance				21,000
Reinsurance limit	$ 1,290,000			1,290,000
Reinsurance retention	150,000			150,000
Reinsurance limit, additional utilized amount net of loss reinsurance treaty	10,000			10,000
Reinstatement premium	101,000			101,000
Reduction of reinsurance limit	$ 6,500			6,500
Reinsurance recovered and recoverable		(1,293,500)	(1,293,500)	(1,293,500)
Loss from catastrophes, share of indirect losses, gross		108,500	99,000	$ 99,216
Assessment for shortfall		50,000
Percentage of recoupable assesment	50.00%			50.00%
Recoupable assessment		$ (25,000)	$ (25,000)	$ (25,000)
Net Fair Plan losses and loss adjustment expenses				$ 74,000
Net loss recorded	$ 22,000
Minimum
Unusual or Infrequent Item, or Both [Line Items]
Average payout percentage by utility companies	55.00%			55.00%
Maximum
Unusual or Infrequent Item, or Both [Line Items]
Average payout percentage by utility companies	70.00%			70.00%