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 6 Months Ended
Jun. 30, 2017
USD ($)
ft²
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
ft²
Jun. 30, 2016
USD ($)
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 $ 253 $ 187 $ 3,999 $ 230  
Aggregate Gain on Sale of Real Estate, net $ (1,914) $ 0 $ 3,992 $ 0  
Disposed of by sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Aggregate Square Footage Sold | ft² 507,455   507,455    
Aggregate Sales Price     $ 25,802    
Aggregate Sales Costs     512    
Impairment charge     1,308    
Aggregate Gain on Sale of Real Estate, net $ (1,900)   $ 3,992