Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details 2)

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Fair Value Measurements (Details 2) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Assets and liabilities measured at fair value on a non-recurring basis            
Impairment losses     $ 1,238 $ 1,302 $ 1,238 $ 1,302
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 [Member] | Fair Value, Measurements, Nonrecurring [Member]            
Assets and liabilities measured at fair value on a non-recurring basis            
Impairment losses     $ 1,238 $ 1,302 $ 1,238 $ 1,302
Northern Virginia | Real Estate Investment Properties, Net [Member] | Fair Value, Measurements, Nonrecurring [Member]            
Assets and liabilities measured at fair value on a non-recurring basis            
Impairment losses $ 1,200          
Greater Baltimore | Real Estate Investment Properties, Net [Member] | Fair Value, Measurements, Nonrecurring [Member]            
Assets and liabilities measured at fair value on a non-recurring basis            
Impairment losses   $ 1,300