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Investments - Related Parties - Illinois Center Building, L.P. (Details) - Illinois Center Building, 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
ACP Re Group, Inc.          
Schedule of Equity Method Investments          
Limited Partnership, Percentage Participation 37.50%   37.50%    
ACP Re          
Schedule of Equity Method Investments          
Limited Partnership, Percentage Participation 15.00%   15.00%    
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 $ 42,605   $ 42,605   $ 44,379
Equity in earnings (losses) (1,520) $ (790) (1,774) $ (2,012)  
Contribution of Property $ 0 $ 1,125 $ 0 $ 1,125  
VIE, Not primary beneficiary | Related Parties | AmTrust Financial Services, Inc.          
Schedule of Equity Method Investments          
Ownership percentage 37.50%   37.50%