Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Related party liabilities          
Other liabilities (promissory note) $ 17,616   $ 17,616   $ 14,478
Related party revenue          
Total revenue 91,360 $ 104,399 178,839 $ 209,363  
Investment management fees          
Related party revenue          
Total revenue 78,042 88,998 152,453 178,128  
Fund administration and distribution fees          
Related party revenue          
Total revenue 13,318 15,401 26,386 31,235  
VCH          
Related party assets          
Receivables (Investment management fees) 20,178   20,178   19,612
Receivables (Fund administration and distribution fees) 3,148   3,148   3,153
Investments (Available-for-sale securities, fair value) 722   722   601
Investments (Trading securities, at fair value) 15,503   15,503   12,343
Total 39,551   39,551   35,709
Related party liabilities          
Accounts payable and accrued expenses (fund reimbursements) 3,782   3,782   2,300
Other liabilities (promissory note)         96
Total 3,782   3,782   $ 2,396
Related party revenue          
Total revenue 69,034 81,877 135,894 163,577  
Related party expense          
Distribution and other asset-based expenses (fund reimbursements)   3,347   6,280  
General and administrative   (6)   135  
Total   3,341   6,415  
Related party other income (expense)          
Interest expense and other income/(expense) 455 265 1,816 166  
Interest expense and other financing costs (promissory note)   (5) (1) (11)  
Total 455 260 1,815 155  
VCH | Investment management fees          
Related party revenue          
Total revenue 55,716 66,476 109,508 132,342  
VCH | Fund administration and distribution fees          
Related party revenue          
Total revenue $ 13,318 $ 15,401 $ 26,386 $ 31,235