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Goodwill and Other Intangibles (Goodwill Activity by Segment) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Mar. 06, 2015
property
Goodwill [Roll Forward]      
Goodwill, beginning balance $ 1,656,374 $ 1,894,794  
Goodwill allocated to dispositions and held for sale assets (53,764) (66,789)  
Goodwill, ending balance 1,602,610 1,828,005  
Mortgages [Member]      
Goodwill [Roll Forward]      
Number of properties foreclosed upon | property     2
REI segment [Member]      
Goodwill [Roll Forward]      
Goodwill, beginning balance 1,410,631 1,509,396  
Goodwill allocated to dispositions and held for sale assets (53,764) (66,789)  
Goodwill, ending balance 1,356,867 1,442,607  
REI segment [Member] | Disposed of and classified as held for sale [Member]      
Goodwill [Roll Forward]      
Goodwill allocated to cost basis of properties 51,500    
REI segment [Member] | Properties foreclosed upon [Member]      
Goodwill [Roll Forward]      
Goodwill allocated to cost basis of properties 2,300    
Cole Capital Segment [Member]      
Goodwill [Roll Forward]      
Goodwill, beginning balance 245,743 385,398  
Goodwill allocated to dispositions and held for sale assets 0 0  
Goodwill, ending balance $ 245,743 $ 385,398