Loss And Loss Adjustment Expense Reserves (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Unusual or Infrequent Item, or Both [Line Items]
Prior year claims and claims adjustment expense	$ (32,138)	$ 49,942
Catastrophe
Unusual or Infrequent Item, or Both [Line Items]
Liability for catastrophe claims, carrying amount	223,000	62,000
Adjustments for prior year claims	$ 4,000	$ (4,000)