Quarterly report pursuant to Section 13 or 15(d)

Subsequent Event (Details)

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Subsequent Event (Details)
ft² in Thousands, $ in Thousands
9 Months Ended
Oct. 27, 2015
USD ($)
ft²
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Subsequent Event [Line Items]      
Gain on sale   $ 4,000 $ 10,654
Subsequent Event | Northern Virginia | 13200 Woodland Park Rd      
Subsequent Event [Line Items]      
Square footage of real estate properties (in square feet) | ft² 397    
Transaction value of operating property disposition $ 84,000    
Gain on sale $ 42,000