Loss And Loss Adjustment Expense Reserves (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Unusual or Infrequent Item, or Both [Line Items]
Prior years	$ 47,281	$ (26,091)	$ 22,979
Catastrophe
Unusual or Infrequent Item, or Both [Line Items]
Prior years	47,300	(26,100)	23,000
Pre-tax catastrophe losses, net of reinsurance benefits	102,000	104,000	64,000
Pre-tax catastrophe losses	101,000	109,000	69,000
Prior year claims and claim adjustment expense payments, favorable (unfavorable) outcome	$ (1,000)	$ 5,000	$ 5,000