Statutory Balances and Accounting Practices (Schedule Of Statutory Net Income And Capital And Surplus) (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Statutory Balances And Accounting Practices [Abstract]
Statutory net income	[1]	$ 200,488	$ 283,928	$ 135,670
Statutory capital and surplus		$ 1,827,210	$ 1,768,103	$ 1,539,998
RBC authorized control level		4	3.50	4
Minimum RBC authorized control level		2	2	2

[1] Statutory net income reflects differences from GAAP net income, including changes in the fair value of the investment portfolio as a result of the application of the fair value option.