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Investments in Unconsolidated Real Estate Ventures - Schedule of Investments in Unconsolidated Real Estate Ventures (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Property
Dec. 31, 2016
USD ($)
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]      
Equity method ownership percentage 25.00%   50.00%
Investment balance $ 70,091 $ 79,570  
Minimum      
Schedule of Equity Method Investments [Line Items]      
Equity method ownership percentage 10.00% 20.00%  
Maximum      
Schedule of Equity Method Investments [Line Items]      
Equity method ownership percentage   50.00%  
PREXR      
Schedule of Equity Method Investments [Line Items]      
Number of Properties | Property 16    
Equity method ownership percentage 45.00%    
Excess profit participation percentage 54.00%    
Investment balance $ 19,467 $ 20,433  
SP I      
Schedule of Equity Method Investments [Line Items]      
Number of Properties | Property 24    
Equity method ownership percentage 25.00%    
Excess profit participation percentage 40.00%    
Investment balance $ 11,495 11,782  
PRISA      
Schedule of Equity Method Investments [Line Items]      
Number of Properties | Property 36    
Equity method ownership percentage 10.00%    
Excess profit participation percentage 30.00%    
Investment balance $ (3,140) 0  
ESW II      
Schedule of Equity Method Investments [Line Items]      
Number of Properties | Property 85    
Equity method ownership percentage 4.00%    
Excess profit participation percentage 4.00%    
Investment balance $ 9,638 10,152  
Clarendon      
Schedule of Equity Method Investments [Line Items]      
Number of Properties | Property 5    
Equity method ownership percentage 5.00%    
Excess profit participation percentage 40.00%    
Investment balance $ 3,939 4,048  
PRISA II      
Schedule of Equity Method Investments [Line Items]      
Number of Properties | Property 16    
Equity method ownership percentage 5.00%    
Excess profit participation percentage 20.00%    
Investment balance $ (357) 160  
ESW      
Schedule of Equity Method Investments [Line Items]      
Number of Properties | Property 7    
Equity method ownership percentage 5.00%    
Excess profit participation percentage 40.00%    
Investment balance $ (900) (546)  
ESNPS      
Schedule of Equity Method Investments [Line Items]      
Number of Properties | Property 10    
Equity method ownership percentage 10.00%    
Excess profit participation percentage 35.00%    
Investment balance $ (1,279) (905)  
Other Minority Owned Properties      
Schedule of Equity Method Investments [Line Items]      
Number of Properties | Property 15    
Investment balance $ 31,228 34,446  
Other Minority Owned Properties | Minimum      
Schedule of Equity Method Investments [Line Items]      
Equity method ownership percentage 10.00%    
Excess profit participation percentage 19.00%    
Other Minority Owned Properties | Maximum      
Schedule of Equity Method Investments [Line Items]      
Equity method ownership percentage 50.00%    
Excess profit participation percentage 50.00%    
Total Investment      
Schedule of Equity Method Investments [Line Items]      
Number of Properties | Property 214    
Investment balance $ 70,091 $ 79,570