Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income before noncontrolling interests	$ (3,526)	$ 181,614
Other comprehensive (loss) income:
Change in unrealized currency translation adjustments	(98,194)	19,760
Change in unrealized investment (losses) gains, net of taxes	(258,981)	125,774
Other comprehensive income (loss)	(357,175)	145,534
Comprehensive (loss) income	(360,701)	327,148
Noncontrolling interests	(893)	(845)
Comprehensive (loss) income to common stockholders	$ (361,594)	$ 326,303