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Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Goodwill [Line Items]    
Balance, beginning of the period $ 92,279 $ 91,797
Business acquisition 4,979 5,966
Effect of exchange rates changes (8,608) 505
Deconsolidation of Venezuelan subsidiaries   (5,989)
Balance, end of the period 88,650 92,279
Brazil [Member]    
Goodwill [Line Items]    
Balance, beginning of the period 32,492 27,660
Business acquisition 3,110 5,966
Effect of exchange rates changes (6,360) (1,134)
Balance, end of the period 29,242 32,492
Argentina [Member]    
Goodwill [Line Items]    
Balance, beginning of the period 5,761 6,587
Business acquisition 1,132  
Effect of exchange rates changes (1,990) (826)
Balance, end of the period 4,903 5,761
Mexico [Member]    
Goodwill [Line Items]    
Balance, beginning of the period 30,396 29,342
Business acquisition 543  
Effect of exchange rates changes 1,895 1,054
Balance, end of the period 32,834 30,396
Chile [Member]    
Goodwill [Line Items]    
Balance, beginning of the period 18,805 17,388
Business acquisition 61  
Effect of exchange rates changes (2,027) 1,417
Balance, end of the period 16,839 18,805
Venezuela [Member]    
Goodwill [Line Items]    
Balance, beginning of the period 5,989
Deconsolidation of Venezuelan subsidiaries   (5,989)
Balance, end of the period  
Colombia [Member]    
Goodwill [Line Items]    
Balance, beginning of the period 3,632 3,643
Business acquisition 80  
Effect of exchange rates changes (73) (11)
Balance, end of the period 3,639 3,632
Other Countries [Member]    
Goodwill [Line Items]    
Balance, beginning of the period 1,193 1,188
Business acquisition 53  
Effect of exchange rates changes (53) 5
Balance, end of the period $ 1,193 $ 1,193