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Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Fair value assumptions            
Discrete forecast period (in years)   5 years 5 years      
Annual average revenue growth rate (percent)   3.00% 3.00%      
Projected growth rates after discrete forecast period (percent)   3.00% 3.00%      
Control premium (percent)   30.00% 30.00%      
Goodwill impairment charge $ 0 $ 29,600 $ 85,900 $ 0 $ 115,483 $ 0
International            
Fair value assumptions            
Enterprise value/EBITDA multiples, public company method   3 5      
Enterprise value/EBITDA multiples, guideline transaction method     7      
Percentage of excess of fair value of goodwill over carrying value (percent)   25.00% 30.00%      
Goodwill impairment charge         115,483  
Preliminary impairment charge as a percent of International goodwill     69.00%      
North America            
Fair value assumptions            
Enterprise value/EBITDA multiples, public company method   6 6      
Enterprise value/EBITDA multiples, guideline transaction method   7 7      
Percentage of excess of fair value of goodwill over carrying value (percent)   25.00% 30.00%      
Goodwill impairment charge         $ 0  
Weighted Average Cost of Capital | International            
Fair value assumptions            
Weighted average cost of capital (percent)   17.00% 17.00%      
Weighted Average Cost of Capital | North America            
Fair value assumptions            
Weighted average cost of capital (percent)   13.00% 14.00%      
Income Approach Valuation Technique | International            
Fair value assumptions            
Percent of total fair value   75.00%        
Income Approach Valuation Technique | North America            
Fair value assumptions            
Percent of total fair value   50.00%        
Market Approach Valuation Technique | International            
Fair value assumptions            
Percent of total fair value   25.00%        
Market Approach Valuation Technique | North America            
Fair value assumptions            
Percent of total fair value   50.00%