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Business Combinations (Narrative) (Details)
9 Months Ended
Feb. 12, 2016
center
Sep. 30, 2016
property
center
Business Acquisition [Line Items]    
Number of acquired centers | property   3
Business Combination Achieved in Stages [Member]    
Business Acquisition [Line Items]    
Business acquisition, percentage of voting interests acquired 49.00%  
Number of acquired centers 2  
Fair value inputs, minority interest discount rate 20.00%  
Series of Individually Immaterial Business Acquisitions [Member]    
Business Acquisition [Line Items]    
Business acquisition, percentage of voting interests acquired   50.00%
Number of acquired centers   3
Minimum [Member] | Business Combination Achieved in Stages [Member]    
Business Acquisition [Line Items]    
Fair value input, discount rate 6.50%  
Fair value inputs, terminal capitalization rate 6.00%  
Maximum [Member] | Business Combination Achieved in Stages [Member]    
Business Acquisition [Line Items]    
Fair value input, discount rate 8.00%  
Fair value inputs, terminal capitalization rate 7.50%