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Fair Value Measures - Narrative (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
reporting_unit
property
Dec. 31, 2015
USD ($)
property
Dec. 31, 2014
USD ($)
property
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Properties impaired | property   153 202 16
Impairment charges   $ 182,819,000 $ 91,755,000 $ 100,500,000
Goodwill impairment $ 0 120,931,000 139,655,000  
Impairment of intangible assets   $ 0 73,700,000 86,400,000
Number of reporting units | reporting_unit   2    
Minimum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rates   6.70%    
Capitalization rates   6.70%    
Maximum [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rates   9.00%    
Capitalization rates   12.50%    
Weighted Average [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount rates   8.00%    
Capitalization rates   7.90%    
Cole Capital Segment [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Goodwill impairment   $ 120,931,000 139,655,000 223,100,000
Number of reporting units | reporting_unit   1    
Increase in impairment loss on goodwill with 1.0% increase in discount rate   $ 6,500,000    
Percent change with 1.0% increase in discount rate, goodwill 5.40% 5.40%    
REI Segment [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Goodwill impairment   $ 0 0 0
Carrying value $ 18,300,000,000 $ 18,300,000,000 $ 19,700,000,000 $ 20,400,000,000
Percentage of fair value in excess of carrying value 21.00% 21.00% 13.00% 5.50%
Percentage of fair value in excess of carrying value, with 1.0% increase in discount rate 8.60% 8.60%    
Reported Value Measurement [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Estimated fair value of real estate assets deemed to be impaired $ 485,400,000 $ 485,400,000 $ 248,300,000 $ 99,000,000