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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]    
Due from related parties $ 2,254 $ 2,415
Other 556 556
Investments in and advances to unconsolidated affiliates 311,540 302,070
Distributions in excess of income from, and investments in, unconsolidated affiliates $ 15,226 15,292
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 $ 161 167
Self Storage Management    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 95.00%  
Equity method investments $ 206 206
Fund III    
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 367 373
Broughton St. Portfolio Savannah, GA    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 50.00%  
Equity method investments $ 41,331 48,335
Cumulative capital contribution, percentage 15.00%  
Cumulative capital contribution $ 15,700 15,400
Preferred return percentage 9.00%  
Preferred return $ 30,200 36,800
Fund IV Other Portfolio    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 90.00%  
Equity method investments $ 16,101 20,199
650 Bald Hill Road    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 90.00%  
Equity method investments $ 13,506 13,609
Fund IV    
Schedule of Equity Method Investments [Line Items]    
Equity method investments 70,938 82,143
Core Portfolio    
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 237,425 216,583
Core Portfolio | 840 N. Michigan    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 88.43%  
Equity method investments $ 69,265 69,846
Core Portfolio | Renaissance Portfolio    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 20.00%  
Equity method investments $ 34,294 35,041
Core Portfolio | Gotham Plaza    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 49.00%  
Equity method investments $ 29,408 29,416
Core Portfolio | Town Center    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 75.22%  
Equity method investments $ 100,918 78,801
Core Portfolio | Georgetown Portfolio    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 50.00%  
Equity method investments $ 3,540 3,479
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 $ 15,226 $ 15,292