Loss And Loss Adjustment Expense Reserves (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Unusual or Infrequent Item, or Both [Line Items]
Prior year claims and claims adjustment expense	$ (15,484)	$ 52,911
Catastrophe
Unusual or Infrequent Item, or Both [Line Items]
Liability for catastrophe claims, carrying amount	$ 98,000	$ 22,000