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Real Estate Activity Dispositions and Impairments (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Real Estate Investments, Net [Abstract]        
Number of real estate dispositions     5 0
Proceeds from sale of real estate shopping centers     $ 45,600  
Gain on sale of property $ 4,571 $ 0 5,556 $ 0
Impairment of Real Estate $ 16,757 $ 0 $ 27,696 $ 0