Quarterly report pursuant to Section 13 or 15(d)

Real Estate Dispositions, Held for Sale and Impairment Charges Real Estate Dispositions, Held for Sale and Impairment Charges - Summary of Property Sold (Details)

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Real Estate Dispositions, Held for Sale and Impairment Charges Real Estate Dispositions, Held for Sale and Impairment Charges - Summary of Property Sold (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
ft²
Mar. 31, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Impairment charge $ 0 $ 3,746,000
Aggregate Gain on Sale of Real Estate, net $ 1,844,000 $ 5,906,000
Disposed of by sale    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Aggregate Square Footage Sold | ft² 166,200  
Aggregate Sales Price $ 11,100,000  
Aggregate Sales Costs 327,000  
Aggregate Gain on Sale of Real Estate, net $ 1,844,000