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Real Estate (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Feb. 22, 2017
Feb. 01, 2017
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Real Estate Properties [Line Items]          
Purchase price of acquired property       $ 28,836,000 $ 31,928,000
Impairment charge     $ 9,850,000 9,850,000  
Christina Crossing [Member]          
Real Estate Properties [Line Items]          
Purchase price of acquired property $ 27,900,000        
Transaction costs $ 900,000        
Camp Hill [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Real Estate Properties [Line Items]          
Sales price of real estate sold   $ 10,700,000      
Gain on sale of real estate   $ 7,100,000      
Fredericksburg Way [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Real Estate Properties [Line Items]          
Impairment charge       $ 9,900,000