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 6 Months Ended
Jun. 30, 2018
USD ($)
ft²
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
ft²
Jun. 30, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Impairment charge $ 0 $ 253,000 $ 0 $ 3,999,000
Aggregate Gain on Sale of Real Estate, net $ 0 $ (1,914,000) $ 1,844,000 $ 3,992,000
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   166,200  
Aggregate Sales Price     $ 11,100,000  
Aggregate Sales Costs     327,000  
Aggregate Gain on Sale of Real Estate, net     $ 1,844,000