Dividends From Subsidiaries And Statutory Financial Information (Schedule of Combined Net Income and Policyholders' Surplus in Accordance with Statutory Accounting Practices) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Insurance [Abstract]
Amount available for dividend distribution without prior approval from regulatory authorities	$ 1,200,000
Net income	1,358,813	$ 1,040,342	$ 771,990
Policyholders' surplus	8,330,587	$ 6,817,535	$ 6,188,121
Increase in BIC's statutory capital and surplus	$ 171,000
Total Adjusted Capital percentage threshold	200.00%
BIC's Total Adjusted Capital balance	$ 8,200,000
BIC's Total Adjusted Capital balance as percentage of RBC Authorized Control Level	408.00%