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, 2016
USD ($)
ft²
property
Dec. 31, 2015
USD ($)
Dec. 31, 2014
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
Number of Properties Sold | property 6      
Impairment charge $ 2,016 $ 622 $ 14,238  
Aggregate Gain on Real Estate, net $ 242 $ 1,538 $ 1,240  
Assets Sold [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Aggregate Square Footage Sold | ft² 266,814      
Aggregate Sales Price $ 7,106      
Aggregate Sales Costs 433      
Impairment charge 230      
Aggregate Gain on Real Estate, net $ 242