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Investments - Related Parties - North Dearborn (Details) - North Dearborn Building Company, L.P. - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
AmTrust Financial Services, Inc.      
Schedule of Equity Method Investments      
Limited Partnership, Percentage Participation 45.00%    
NA Advisors GP LLC      
Schedule of Equity Method Investments      
Limited Partnership, Percentage Participation 10.00%    
Limited Partnership, Percentage of Profit Interest 10.00%    
VIE, Not primary beneficiary | Related Parties      
Schedule of Equity Method Investments      
Ownership percentage 45.00%    
Equity investment in unconsolidated subsidiaries $ 5,702   $ 5,317
Equity in earnings (losses) 430 $ (28)  
Distributions $ 45 $ 0