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Unconsolidated Affiliates and Noncontrolling Interests - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
holder
entity
shares
Mar. 31, 2018
shares
Jun. 30, 2018
entity
shares
Jun. 30, 2017
shares
Schedule of Equity Method Investments [Line Items]          
Number of equity method investment entities   18   18  
Number of joint ventures   13   13  
Gain on investment related to land contributed to joint venture | $ $ 387        
Cash paid upon conversion of common units | $   $ 2,246      
Number of holders of common units | holder   2      
Issuances of common units (shares) | shares       709,113 336,475
Number of variable interest entities       19  
Ownership in variable interest entity (as a percent)       50.00%  
Minimum          
Schedule of Equity Method Investments [Line Items]          
Equity interest in real estate property (as a percent)   10.00%   10.00%  
Maximum          
Schedule of Equity Method Investments [Line Items]          
Equity interest in real estate property (as a percent)   65.00%   65.00%  
Ownership in variable interest entity (as a percent)       95.00%  
Unconsolidated Properties          
Schedule of Equity Method Investments [Line Items]          
Issuances of common units (shares) | shares   526,510 915,338