Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 4,435
Due after one year through five years	45,012
Due after five years through ten years	443,123
Due after ten years	1,110,727
Total	1,603,297	$ 1,384,607
Estimated Fair Value
Due in one year or less	4,454
Due after one year through five years	44,735
Due after five years through ten years	429,972
Due after ten years	1,018,066
Total	$ 1,497,227	$ 1,408,165