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Summary of Significant Accounting Policies (Real Estate Investments) (Details) - Building and improvements
12 Months Ended
Dec. 31, 2016
Minimum [Member]  
Property, Plant and Equipment [Line Items]  
Life used for depreciation of real estate assets, buildings and improvements 10 years
Maximum [Member]  
Property, Plant and Equipment [Line Items]  
Life used for depreciation of real estate assets, buildings and improvements 31 years