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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary of Significant Accounting Policies [Abstract]      
Accumulated Other Comprehensive Loss, Foreign Currency Translation Adjustment, Net of Tax $ 15,778 $ 44,444 $ 44,585
Restricted Cash 653 517  
Impairment of Long-Lived Assets $ 0 0 11,199
Number of shares authorized to be repurchased under our stock repurchase programs 1,393,965    
Machine warranty, range minimum (in years) 1 year    
Machine warranty, range maximum (in years) 4 years    
Advertising Costs $ 8,228 $ 7,269 $ 7,418
Buildings and improvements      
Property, Plant and Equipment      
Property, Plant and Equipment, Useful life, Average 30 years    
Property, Plant and Equipment, Other Types | Minimum      
Property, Plant and Equipment      
Property, Plant and Equipment, Useful life, Average 3 years    
Property, Plant and Equipment, Other Types | Maximum      
Property, Plant and Equipment      
Property, Plant and Equipment, Useful life, Average 15 years