Non-controlling Interests (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Noncontrolling Interest [Line Items]
Non-redeemable non-controlling interests	$ 0	$ 16
Total non-controlling interest in net income	(25,571)	10,116
Redeemable non-controlling interest	224,900		$ 325,561
Other
Noncontrolling Interest [Line Items]
Non-redeemable non-controlling interests	0	16
Company-sponsored investment funds
Noncontrolling Interest [Line Items]
Non-redeemable non-controlling interests	0	0
Redeemable non-controlling interests	(25,571)	$ 10,100
Redeemable non-controlling interest	$ 224,900		$ 325,561