Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interests	$ 71,656	$ 217,427	$ 68,130	$ 399,041
Other comprehensive income (loss):
Change in unrealized currency translation adjustments	21,447	(14,492)	(76,747)	5,268
Change in unrealized investment gains, net of taxes	318,725	118,649	59,743	244,424
Other comprehensive income (loss)	340,172	104,157	(17,004)	249,692
Comprehensive income	411,828	321,584	51,126	648,733
Noncontrolling interests	(395)	(748)	(1,289)	(1,592)
Comprehensive income to common stockholders	$ 411,433	$ 320,836	$ 49,837	$ 647,141