Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less	$ 3,078
Due after one year through five years	119,763
Due after five years through ten years	388,186
Due after ten years	1,102,509
Total	1,613,536	$ 1,479,545
Estimated Fair Value
Due in one year or less	3,046
Due after one year through five years	113,772
Due after five years through ten years	358,188
Due after ten years	981,679
Total	$ 1,456,685	$ 1,338,137