Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 29,703
Due after one year through five years	535,293
Due after five years through ten years	682,768
Due after ten years	428,830
Total	1,676,594	$ 1,384,607
Estimated Fair Value
Due in one year or less	3,460
Due after one year through five years	45,750
Due after five years through ten years	477,125
Due after ten years	963,057
Total	$ 1,489,392	$ 1,408,165