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Real Estate Fund Investments - 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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Our Share of Investments:          
Investments in unconsolidated real estate funds $ 8,146   $ 8,146   $ 28,173
Loss from unconsolidated real estate funds (3,930) $ (1,254) (6,053) $ (2,540)  
Net realized loss (839)   (665)    
Net unrealized gain (loss) 202 (361) (26) (2,939)  
Net investment income (loss) [Member]          
Our Share of Investments:          
Loss from unconsolidated real estate funds 104 170 228 (437)  
Carried interest [Member]          
Our Share of Investments:          
Loss from unconsolidated real estate funds (3,397) $ (1,063) (5,590) $ 836  
Property Funds [Member]          
Our Share of Investments:          
Investments in unconsolidated real estate funds 2,673   2,673   22,811
Alternative Investment Fund [Member]          
Our Share of Investments:          
Investments in unconsolidated real estate funds $ 5,473   $ 5,473   $ 5,362