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Real Estate Investments (Multi-tenant Shopping Center Portfolio Sale) (Narrative) (Details)
$ in Thousands
12 Months Ended
Oct. 17, 2014
USD ($)
property
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]      
Goodwill allocated to dispositions   $ 98,765 $ 210,139
Multi-tenant Portfolio | 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 properties sold | property 64    
Single-tenant Properties [Member]      
Business Acquisition [Line Items]      
Number of properties sold | property 7