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Real Estate Investments - Multi-tenant Shopping Center Portfolio Sale (Details)
$ in Thousands
12 Months Ended
Oct. 17, 2014
USD ($)
property
Dec. 31, 2016
USD ($)
property
Dec. 31, 2015
USD ($)
property
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]        
Number of real estate properties disposed | property   101 228  
Goodwill allocated to dispositions   $ 73,240 $ 98,765  
Disposed of by Sale, Not Discontinued Operations [Member]        
Business Acquisition [Line Items]        
Total revenue       $ 122,522
Total expenses       (123,776)
Loss from Multi-Tenant Portfolio       $ (1,254)
Multi-tenant Portfolio [Member] | Joint Venture between Affiliates of Blackstone Real Estate Partners VII and DDR Corporation [Member]        
Business Acquisition [Line Items]        
Proceeds from sale of portfolio $ 1,900,000      
Net proceeds 1,300,000      
Proceeds used to reduce Company's leverage 1,200,000      
Secured mortgage debt repaid or assumed 542,800      
Net loss on sale 262,000      
Goodwill allocated to dispositions $ 195,500      
Multi-tenant Properties [Member]        
Business Acquisition [Line Items]        
Number of real estate properties disposed | property 64      
Single-tenant Properties [Member]        
Business Acquisition [Line Items]        
Number of real estate properties disposed | property 7