Investments (Estimated Fair Value Of Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fixed maturity securities:
Due in one year or less	$ 149,255
Due after one year through five years	977,997
Due after five years through ten years	633,232
Due after ten years	2,327,827
Total	$ 4,088,311	$ 4,031,523
External credit rating, non investment grade [Member]
Credit Derivatives [Line Items]
Percentage of fixed maturities	0.60%