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Subsequent Events (Details) - Subsequent Event [Member]
$ / shares in Units, ft² in Thousands, $ in Millions
Aug. 02, 2016
$ / shares
Aug. 01, 2016
USD ($)
building
Jul. 29, 2016
USD ($)
ft²
$ / squarefeet
Jul. 27, 2016
USD ($)
ft²
$ / squarefeet
Subsequent Event [Line Items]        
Dividends declared (in dollars per share) | $ / shares $ 0.21      
9221 Corporate Drive [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]        
Subsequent Event [Line Items]        
Square footage of real estate property | ft²       115
Gross sales price       $ 12.7
Sales price per square foot | $ / squarefeet       110
150 West Jefferson building [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]        
Subsequent Event [Line Items]        
Square footage of real estate property | ft²     490  
Gross sales price     $ 81.5  
Sales price per square foot | $ / squarefeet     166  
Percentage leased     88.20%  
CNL Tower I and II [Member]        
Subsequent Event [Line Items]        
Percentage of controlling interest acquired   99.00%    
Number of trophy office buildings acquired | building   2    
Amount of acquisition   $ 166.7