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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments In and Advances to Unconsolidated Affiliates (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage   65.00%    
Due to related parties $ 2,193   $ 725  
Other 957   566  
Investments in and advances to unconsolidated affiliates 272,028   173,277  
Distributions in excess of income from, and investments in, unconsolidated affiliates 13,691   13,244  
Core Portfolio [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investments $ 165,031   81,586  
Core Portfolio [Member] | 840 N. Michigan [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 88.43%      
Equity method investments $ 74,131   76,898  
Core Portfolio [Member] | Renaissance Portfolio [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 20.00%      
Equity method investments $ 36,437   0  
Core Portfolio [Member] | Gotham Plaza [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 49.00%      
Equity method investments $ 29,421   0  
Core Portfolio [Member] | Brandywine Portfolio [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 22.22%      
Equity method investments $ 20,755   0  
Core Portfolio [Member] | Georgetown Portfolio [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 50.00%      
Equity method investments $ 4,287   4,688  
Core Portfolio [Member] | Crossroads [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 49.00%      
Distributions in excess of income from, and investments in, unconsolidated affiliates $ 13,691   13,244  
Mervyns I and Mervyns II [Member] | KLA Mervyns LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 10.50%      
Equity method investments $ 0   0  
Fund III [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investments $ 8,349   13,438  
Fund III [Member] | Fund III Other Portfolio [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 90.00%      
Equity method investments $ 8,108   12,784  
Fund III [Member] | Self Storage Management [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 95.00%      
Equity method investments $ 241   654  
Fund IV [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investments $ 95,498   76,962  
Fund IV [Member] | Broughton Street Portfolio [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 50.00%      
Equity method investments $ 54,839   43,786  
Fund IV [Member] | Fund IV Other Portfolio [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 90.00%      
Equity method investments $ 21,817   24,104  
Fund IV [Member] | 650 Bald Hill Road [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 90.00%     90.00%
Equity method investments $ 18,842   $ 9,072