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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Oct. 24, 2018
Nov. 09, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Subsequent Event [Line Items]            
Payments for Repurchase of Common Stock     $ 2,226 $ 45,732    
Derivative Liability     $ 29,285   $ 37,096 $ 8,510
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Stock Repurchased During Period, Shares   243,651        
Payments for Repurchase of Common Stock   $ 14,000        
Treasury Stock Acquired, Average Cost Per Share   $ 57.60        
Business Travels [Member] | Subsequent Event [Member]            
Subsequent Event [Line Items]            
Fair Value of Business Combination $ 1,100          
Routier [Member] | Subsequent Event [Member]            
Subsequent Event [Line Items]            
Fair Value of Business Combination $ 400