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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2018
Dec. 31, 2019
Loss Contingencies [Line Items]      
Investment company, committed capital, funded $ 101,000    
Hains Point      
Loss Contingencies [Line Items]      
Capital commitment   $ 150,000  
Anacostia LLC | Kah Capital Management LLC (KAH Capital)      
Loss Contingencies [Line Items]      
Ownership percentage acquired   24.90%  
Payment to acquire investment   $ 25  
Investment Advisory Services | Kah Capital Management LLC (KAH Capital)      
Loss Contingencies [Line Items]      
Revenue earned     $ 4,200
Total revenue to be earned $ 6,500   $ 6,500