Loss And Loss Adjustment Expense Reserves (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Unusual or Infrequent Item, or Both [Line Items]
Prior year claims and claims adjustment expense	$ 52,911	$ (1,207)
Catastrophe
Unusual or Infrequent Item, or Both [Line Items]
Pre-tax catastrophe losses, net of reinsurance benefits	22,000	35,000
Liability for catastrophe claims, carrying amount	21,000	39,000
Adjustments for prior year claims	$ (1,000)	$ 4,000