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Investments - Related Parties - North Dearborn (Details) - North Dearborn Building Company, L.P. - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
NA Advisors GP LLC          
Schedule of Equity Method Investments          
Limited Partnership, Percentage Participation 10.00%   10.00%    
Limited Partnership, Percentage of Profit Interest 10.00%   10.00%    
VIE, Not primary beneficiary | Related Parties          
Schedule of Equity Method Investments          
Equity investment in unconsolidated subsidiaries $ 5,704   $ 5,704   $ 5,317
Equity in earnings (losses) (43) $ (84) 792 $ (150)  
Distributions $ 135 $ 135 $ 405 $ 405  
VIE, Not primary beneficiary | Related Parties | AmTrust Financial Services, Inc.          
Schedule of Equity Method Investments          
Ownership percentage 45.00%   45.00%