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Investments - Related Parties - North Dearborn (Details) - North Dearborn Building Company, L.P. - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
AmTrust Financial Services, Inc.          
Schedule of Equity Method Investments          
Limited Partnership, Percentage Participation 45.00%   45.00%    
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 $ 5,882   $ 5,882   $ 5,317
Equity in earnings (losses) 405 $ (38) 835 $ (66)  
Distributions $ 225 $ 270 $ 270 $ 270  
VIE, Not primary beneficiary | Related Parties | AmTrust Financial Services, Inc.          
Schedule of Equity Method Investments          
Ownership percentage 45.00%   45.00%