Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interests	$ 237,678	$ 71,656	$ 469,394	$ 68,130
Other comprehensive income (loss):
Change in unrealized currency translation adjustments	2,537	21,447	6,587	(76,747)
Change in unrealized investment gains (losses), net of taxes	23,272	318,725	(66,858)	59,743
Other comprehensive income (loss)	25,809	340,172	(60,271)	(17,004)
Comprehensive income	263,487	411,828	409,123	51,126
Noncontrolling interests	(439)	(395)	(2,630)	(1,289)
Comprehensive income to common stockholders	$ 263,048	$ 411,433	$ 406,493	$ 49,837