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Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 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 $ 29,560 $ 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%   25.00%  
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%   25.00%  
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%