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Investment in Real Estate - Summary of Property Sold (Details)
$ in Thousands
3 Months Ended
Mar. 21, 2017
USD ($)
ft²
Feb. 14, 2017
USD ($)
ft²
Mar. 31, 2017
USD ($)
ft²
property
Mar. 31, 2016
USD ($)
Dec. 31, 2016
property
Real Estate [Abstract]          
Number of real estate properties acquired (in properties) | property     0    
Real Estate [Line Items]          
Area of real estate property (in square feet) | ft²     199,484    
Sales Price     $ 86,800    
Gains on sale of real estate     $ 16,866 $ 6,352  
Number of properties held for sale (in properties) | property     0   2
222 Kearny Street          
Real Estate [Line Items]          
Area of real estate property (in square feet) | ft²   148,797      
Sales Price   $ 51,800      
3402 Pico Boulevard          
Real Estate [Line Items]          
Area of real estate property (in square feet) | ft² 50,687        
Sales Price $ 35,000