Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interests	$ 152,366	$ 165,151	$ 220,495	$ 564,192
Other comprehensive income (loss):
Change in unrealized currency translation adjustments	40,194	(36,682)	(36,553)	(31,414)
Change in unrealized investment gains (losses), net of taxes	38,273	(24,745)	98,016	219,679
Other comprehensive income (loss)	78,467	(61,427)	61,463	188,265
Comprehensive income	230,833	103,724	281,958	752,457
Noncontrolling interests	(685)	(66)	(1,973)	(1,659)
Comprehensive income to common stockholders	$ 230,148	$ 103,658	$ 279,985	$ 750,798