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Business Combinations (Narrative) (Details)
12 Months Ended
Feb. 12, 2016
center
Dec. 31, 2016
property
center
Sep. 30, 2016
Feb. 29, 2016
Business Acquisition [Line Items]        
Number of businesses acquired | property   3    
Business Combination Achieved in Stages [Member]        
Business Acquisition [Line Items]        
Percentage of voting interest acquired 49.00%     49.00%
Number of businesses acquired 2      
Discount rate 20.00%      
Series of Individually Immaterial Business Acquisitions [Member]        
Business Acquisition [Line Items]        
Percentage of voting interest acquired   50.00% 50.00%  
Number of businesses acquired   3    
Minimum [Member] | Business Combination Achieved in Stages [Member]        
Business Acquisition [Line Items]        
Fair Value Inputs, Discount Rate 6.50%      
Fair Value Inputs, Cap Rate 6.00%      
Maximum [Member] | Business Combination Achieved in Stages [Member]        
Business Acquisition [Line Items]        
Fair Value Inputs, Discount Rate 8.00%      
Fair Value Inputs, Cap Rate 7.50%