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Business Combinations (Narrative) (Details) - center
12 Months Ended
Feb. 12, 2016
Dec. 31, 2016
Sep. 30, 2016
Feb. 29, 2016
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]        
Discount rate 6.50%      
Capitalization rate 6.00%      
Maximum [Member] | Business Combination Achieved in Stages [Member]        
Business Acquisition [Line Items]        
Discount rate 8.00%      
Capitalization rate 7.50%