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)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
ft²
Jun. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
ft²
Sep. 30, 2016
USD ($)
Jul. 25, 2014
ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Aggregate Square Footage Sold | ft²           81,371
Impairment charge $ 0 $ 300 $ 1,786 $ 3,999 $ 2,016  
Aggregate Gain on Sale of Real Estate, net $ 1   $ (24) $ 3,993 (24)  
Disposed of by sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Aggregate Square Footage Sold | ft² 593,763     593,763    
Aggregate Sales Price       $ 30,302    
Aggregate Sales Costs       803    
Impairment charge       3,999 $ 700  
Aggregate Gain on Sale of Real Estate, net       $ 3,993