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Real Estate (Narrative) (Details) - USD ($)
6 Months Ended
May 04, 2016
Feb. 25, 2016
Feb. 11, 2016
Jun. 30, 2016
Jun. 30, 2015
Real Estate Properties [Line Items]          
Purchase price of acquired property       $ 31,928,000 $ 24,453,000
Shoppes at Arts District [Member]          
Real Estate Properties [Line Items]          
Purchase price of acquired property   $ 20,500,000      
Mortgage interest rate   5.20%      
Mortgage maturity date   Apr. 01, 2022      
Shoppes at Arts District [Member] | Parent Company [Member]          
Real Estate Properties [Line Items]          
Purchase price of acquired property   $ 8,500,000      
Glenwood Village [Member]          
Real Estate Properties [Line Items]          
Purchase price of acquired property $ 19,500,000        
Liberty Marketplace [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Real Estate Properties [Line Items]          
Sales price of real estate sold     $ 15,000,000