Supplemental Financial Statement Data (Schedule of Other Operating Cost and Expense, by Component) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Income and Expenses [Abstract]
Amortization of deferred policy acquisition costs	$ 1,038,975	$ 1,038,903	$ 961,628
Insurance operating expenses	1,915,711	1,635,000	1,345,099
Insurance service expenses	91,714	96,419	86,003
Net foreign currency losses (gains)	31,799	(50,930)	(25,725)
Debt extinguishment costs	0	0	11,521
Other costs and expenses	285,737	242,113	220,744
Total	$ 3,363,936	$ 2,961,505	$ 2,599,270