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Disposed Properties - Narrative (Details)
ft² in Thousands, $ in Thousands
 3 Months Ended
Mar. 21, 2018
Properties
Mar. 31, 2018
USD ($)
ft²
Properties
Mar. 31, 2017
USD ($)
ft²
Dec. 31, 2017
ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of disposed properties   18,280    
Gain on transfer of asset, retail properties   $ 1,777    
Gain (loss) on condemnation   248    
Proceeds from sale and transfer of investment properties, net   119,825 $ 28,474  
Number of surrendered properties | Properties 1      
Carrying value, surrendered properties   23,932    
Gain on extinguishment of debt   $ 10,751 $ 0  
Square Feet | ft²   3,000 300 3,200
Gross disposition price   $ 127,500 $ 29,050  
Retail        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Square Feet | ft²   11,200 12,700 12,400
Retail | Penn Park, Oklahoma City, OK        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale and transfer of investment properties, net     $ 28,474  
Square Feet | ft²     242  
Gross disposition price     $ 29,050  
Gain on sale     $ 1,021  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Retail        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of disposed properties | Properties   3    
Square Feet | ft²   1,007    
Gross disposition price   $ 127,500