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Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments In and Advances to Unconsolidated Affiliates (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]    
Due to related parties $ 2,273 $ 2,193
Other 957 957
Investments in and advances to unconsolidated affiliates 260,497 272,028
Distributions in excess of income from, and investments in, unconsolidated affiliates $ 15,221 13,691
Cumulative capital contribution, percentage 15.00%  
Preferred return percentage 9.00%  
Cumulative capital contribution $ 14,900  
Preferred return 46,400  
Core Portfolio [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 163,534 165,031
Core Portfolio [Member] | 840 N. Michigan [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 88.43%  
Equity method investments $ 73,355 74,131
Core Portfolio [Member] | Renaissance Portfolio [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 20.00%  
Equity method investments $ 36,097 36,437
Core Portfolio [Member] | Gotham Plaza [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 49.00%  
Equity method investments $ 29,396 29,421
Core Portfolio [Member] | Brandywine Portfolio [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 22.22%  
Equity method investments $ 20,449 20,755
Core Portfolio [Member] | Georgetown Portfolio [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 50.00%  
Equity method investments $ 4,237 4,287
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 $ 15,221 13,691
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 $ 466 8,349
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 $ 225 8,108
Fund III [Member] | Self Storage Management [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 95.00%  
Equity method investments $ 241 241
Fund IV [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 93,267 95,498
Fund IV [Member] | Broughton Street Portfolio [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 50.00%  
Equity method investments $ 56,313 54,839
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 $ 17,927 21,817
Fund IV [Member] | 650 Bald Hill Road [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity method investment, ownership percentage 90.00%  
Equity method investments $ 19,027 $ 18,842