Supplemental Financial Statement Data (Schedule of Other Operating Cost and Expense, by Component) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Amortization of deferred policy acquisition costs	$ 1,001,611	$ 915,246	$ 1,111,489
Insurance operating expenses	1,088,690	1,183,635	989,535
Insurance service expenses	101,317	118,357	129,776
Net foreign currency (gains) losses	(30,715)	(27,067)	15,267
Other costs and expenses	201,179	193,050	190,865
Total	$ 2,362,082	$ 2,383,221	$ 2,436,932