Redeemable Noncontrolling Interests - Schedule of Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Beginning balance			$ 57,481
Net income (loss) attributable to noncontrolling interests	$ 1,342	$ 823	3,266	$ 743
Net subscriptions (redemptions) and other	29,766	$ 505	30,863	$ (173)
Ending balance	91,610		91,610
CIP
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Beginning balance			2,384
Net income (loss) attributable to noncontrolling interests			774
Net subscriptions (redemptions) and other			35,316
Ending balance	38,474		38,474
Affiliate Noncontrolling Interests
Increase (Decrease) in Redeemable Non-controlling Interests [Roll Forward]
Beginning balance			55,097
Net income (loss) attributable to noncontrolling interests			2,492
Net subscriptions (redemptions) and other			(4,453)
Ending balance	$ 53,136		$ 53,136