Investments (Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Amortized Cost
Due in one year or less	$ 16,039
Due after one year through five years	151,733
Due after five years through ten years	311,224
Due after ten years	1,066,356
Total	1,545,352	$ 1,570,449
Estimated Fair Value
Due in one year or less	15,959
Due after one year through five years	145,816
Due after five years through ten years	293,572
Due after ten years	961,461
Total	$ 1,416,808	$ 1,421,306