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Non-controlling Interests (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Noncontrolling Interest [Line Items]          
Non-redeemable non-controlling interests $ 18 $ 32 $ 92 $ 150  
Total non-controlling interest in net income 4,145 726 22,018 23,637  
Non-redeemable non-controlling interest 0   0   $ 949
Redeemable non-controlling interest 291,524   291,524   148,809
CPH acquisition          
Noncontrolling Interest [Line Items]          
Non-redeemable non-controlling interest 0   0   949
Redeemable non-controlling interest $ 0   $ 0   2,888
Ownership percentage 100.00%   100.00%    
Other          
Noncontrolling Interest [Line Items]          
Non-redeemable non-controlling interests $ 18 78 $ 92 249  
Company-sponsored investment funds          
Noncontrolling Interest [Line Items]          
Non-redeemable non-controlling interests 0 (46) 0 (99)  
Redeemable non-controlling interests 4,127 $ 694 21,926 $ 23,487  
Non-redeemable non-controlling interest 0   0   0
Redeemable non-controlling interest $ 291,524   $ 291,524   $ 145,921