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Real Estate (Narrative) (Details) - USD ($)
3 Months Ended
Feb. 22, 2017
Feb. 01, 2017
Mar. 31, 2017
Mar. 31, 2016
Real Estate Properties [Line Items]        
Purchase price of acquired property     $ 28,836,000 $ 12,090,000
Christina Crossing [Member]        
Real Estate Properties [Line Items]        
Purchase price of acquired property $ 27,900,000      
Transaction costs $ 900,000      
Camp Hill | Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Real Estate Properties [Line Items]        
Sales price of real estate sold   $ 10,700,000    
Gain on sale of real estate   $ 7,100,000