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Investments in Unconsolidated Real Estate Funds - Summary of Investment in Unconsolidated Real Estate Funds and Income or Loss from Fund Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Our Share of Investments:          
Investments in unconsolidated real estate funds $ 9,007   $ 9,007   $ 7,253
(Loss) income from unconsolidated real estate funds (188) $ (3,930) (268) $ (6,053)  
Net realized loss   (839)   (665)  
Net unrealized (loss) gain (270) 202 (475) (26)  
Net investment income [Member]          
Our Share of Investments:          
(Loss) income from unconsolidated real estate funds 82 104 207 228  
Carried interest [Member]          
Our Share of Investments:          
(Loss) income from unconsolidated real estate funds   $ (3,397)   $ (5,590)  
Property Funds [Member]          
Our Share of Investments:          
Investments in unconsolidated real estate funds 2,059   2,059   2,429
Alternative Investment Fund [Member]          
Our Share of Investments:          
Investments in unconsolidated real estate funds $ 6,948   $ 6,948   $ 4,824