Annual report pursuant to Section 13 and 15(d)

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

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Real Estate Dispositions, Held for Sale, and Impairment Charges - Summary of Properties Sold (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
ft²
property
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jul. 25, 2014
ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of non-core properties sold | property 3      
Aggregate Square Footage | ft²       81,371
Aggregate Gain on Sale of Real Estate, net $ 2,763 $ 3,993 $ 242  
Assets disposed of by sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Aggregate Square Footage | ft² 316,200      
Aggregate Sales Price $ 13,400      
Aggregate Sales Costs 565      
Aggregate Gain on Sale of Real Estate, net $ 2,763