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Acquisitions - Development Project Acquisitions (Details)
$ in Thousands
3 Months Ended
Mar. 11, 2016
USD ($)
a
Mar. 31, 2016
shares
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]      
Total liabilities assumed     $ 19,172
Brannan St Project [Member]      
Business Acquisition [Line Items]      
Area of land | a 1.75    
Payments to acquire businesses $ 31,000    
Business acquisition, equity interest issued or issuable, number of shares | shares   867,701  
Business acquisition, equity interest issued or issuable, value assigned 48,000    
Business acquisition, transaction costs 2,400    
Total liabilities assumed $ 4,700