Annual report pursuant to Section 13 and 15(d)

Investment Funds Investment Funds - Narrative (Details)

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Investment Funds Investment Funds - Narrative (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
employee
Dec. 31, 2019
USD ($)
fund
Dec. 31, 2018
USD ($)
Variable Interest Entity [Line Items]      
Number of investment funds | fund   5  
Joint venture, number of employees | employee 0    
Contributions to joint venture $ 1,506    
Payments to acquire interest in joint venture 50.00%    
Net asset position of equity method joint ventures   $ 1,292 $ 0
Expense recognized from equity method joint ventures   $ 183 $ 0
Other Assets      
Variable Interest Entity [Line Items]      
Equity method investment $ 1,361    
Operating Income (Loss)      
Variable Interest Entity [Line Items]      
VIE, impact of deconsolidation $ 2,160