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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Our Share of Investments:          
Investments in unconsolidated real estate funds $ 9,292   $ 9,292   $ 7,253
(Loss) income from unconsolidated real estate funds (14) $ (2,411) (80) $ (2,123)  
Net realized (loss) gain   (5)   174  
Net unrealized loss (73) (324) (205) (228)  
Net investment income [Member]          
Our Share of Investments:          
(Loss) income from unconsolidated real estate funds 59 71 125 124  
Carried interest [Member]          
Our Share of Investments:          
(Loss) income from unconsolidated real estate funds   $ (2,153)   $ (2,193)  
Property Funds [Member]          
Our Share of Investments:          
Investments in unconsolidated real estate funds 2,352   2,352   2,429
Alternative Investment Fund [Member]          
Our Share of Investments:          
Investments in unconsolidated real estate funds $ 6,940   $ 6,940   $ 4,824