Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Real Estate Dispositions, Held for Sale, and Impairment Charges - Summary of Properties Sold (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
ft²
property
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
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       4      
Aggregate Square Footage | ft²             81,371
Impairment charge     $ 3,700 $ 6,835 $ 2,016 $ 622  
Aggregate Gain on Sale of Real Estate, net $ 1 $ (1,800)   $ 3,993 $ 242 $ 1,538  
Assets Sold [Member]              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Aggregate Square Footage | ft²       593,763      
Aggregate Sales Price       $ 30,302      
Aggregate Sales Costs       803      
Impairment charge       3,999      
Aggregate Gain on Sale of Real Estate, net       $ 3,993