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Non-controlling Interests (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Noncontrolling Interest [Line Items]          
Non-redeemable non-controlling interests $ 0 $ 58 $ 0 $ 74  
Redeemable non-controlling interests:          
Total non-controlling interest in net income 20,940 7,757 (4,631) 17,873  
Redeemable non-controlling interest 51,081   51,081   $ 325,561
Other          
Noncontrolling Interest [Line Items]          
Non-redeemable non-controlling interests 0 58 0 74  
Company-sponsored investment funds          
Noncontrolling Interest [Line Items]          
Non-redeemable non-controlling interests 0 0 0 0  
Redeemable non-controlling interests:          
Consolidated company-sponsored investment funds 20,940 $ 7,699 (4,631) $ 17,799  
Redeemable non-controlling interest $ 51,081   $ 51,081   $ 325,561