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Schedule II - Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Valuation and Qualifying Accounts Disclosure [Table Text Block]
    Beginning
Balance		   Additions/
Charged to
Expenses		   Currency
Impact		   Reductions   Balance at
End of
Period
Accounts Receivable Allowance for Doubtful Accounts:                                        
Year ended December 31, 2018   $
1,725
      
618
      
(76
 )    
(104
 )   $
2,163
  
Year ended December 31, 2017   $
2,640
      
(918
 )    
134
      
(131
 )   $
1,725
  
Tax Valuation Allowance:                                        
Year ended December 31, 2018   $
8,647
      
1,616
      
—
      
—
     $
10,263
  
Year ended December 31, 2017   $
11,068
      
—
      
—
      
(2,421
 )   $
8,647
  
Inventory Reserve:                                        
Year ended December 31, 2018   $
59
      
(46
 )    
—
      
(3
 )   $
10
  
Year ended December 31, 2017   $
435
      
(287
 )    
23
      
(112
 )   $
59