Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details 2)

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Fair Value Measurements (Details 2)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Property
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses $ 2,307 $ 66 $ 3,545 $ 1,368
Redeemable Non-Controlling Interest | Fair value measurement on a recurring basis | Significant Unobservable Inputs (Level 3)        
Assets and liabilities measured at fair value on a non-recurring basis        
Fair value inputs, discount rate     15.50%  
Real Estate Investment Properties, Net | Fair value measurement on a nonrecurring basis        
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses       $ 1,400
Northern Virginia | Real Estate Investment Properties, Net | Fair value measurement on a nonrecurring basis        
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses     $ 1,300  
Greater Baltimore | Real Estate Investment Properties, Net | Fair value measurement on a nonrecurring basis        
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses $ 2,300      
Number of properties, impairment loss recognized | Property 3