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Equity - Non-controlling Interests Narrative (Details)
Sep. 30, 2014
Sep. 30, 2014
Pinnacle JV
sqft
building
Dec. 31, 2013
Pinnacle II
sqft
Jun. 14, 2013
Pinnacle I
sqft
Class of Stock        
Noncontrolling Interest, Ownership by Noncontrolling Owners Amount 2,382,563      
Number of buildings in property   2    
Area of real estate property   625,640    
Ownership interest in property   65.00%   98.25%
Business acquisition, area of real estate property (in sqft)     231,864 393,776