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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
May 01, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]      
Due to related parties $ 2,343   $ 2,193
Other 556   957
Investments in and advances to unconsolidated affiliates 270,245   272,028
Distributions in excess of income from, and investments in, unconsolidated affiliates $ 15,262   13,691
KLA Mervyns LLC      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 10.50%    
Equity method investments $ 0   0
Fund III Other Portfolio      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 90.00%    
Equity method investments $ 168   8,108
Self Storage Management      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 95.00%    
Equity method investments $ 241   241
Fund III      
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 409   8,349
Broughton Street Portfolio      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 50.00%    
Equity method investments $ 57,368   54,839
Cumulative capital contribution, percentage 15.00%    
Cumulative capital contribution $ 15,200   14,500
Preferred return percentage 9.00%    
Preferred return $ 47,000   45,400
Fund IV Other Portfolio      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 90.00%    
Equity method investments $ 20,392   21,817
650 Bald Hill Road      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 90.00%    
Equity method investments $ 13,642   18,842
Fund IV      
Schedule of Equity Method Investments [Line Items]      
Equity method investments 91,402   95,498
Core Portfolio      
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 175,535   165,031
Core Portfolio | 840 N. Michigan      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 88.43%    
Equity method investments $ 70,859   74,131
Core Portfolio | Renaissance Portfolio      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 20.00%    
Equity method investments $ 35,139   36,437
Core Portfolio | Gotham Plaza      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 49.00%    
Equity method investments $ 29,196   29,421
Core Portfolio | Brandywine Market Square      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 61.11% 61.11%  
Equity method investments $ 20,642 $ 16,600 5,469
Core Portfolio | Brandywine Portfolio      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 22.22%    
Equity method investments $ 15,948   15,286
Core Portfolio | Georgetown Portfolio      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 50.00%    
Equity method investments $ 3,751   4,287
Core Portfolio | Crossroads      
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 $ 15,262   $ 13,691