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Business Segments (Tables)
3 Months Ended
Mar. 31, 2014
Segment Reporting Measurement Disclosures [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   Three Months Ended 
   March 31,  
   2014 2013 
 Net sales      
  North America$76,716 $74,758 
  EMEA 49,189  46,707 
  Asia/Pacific 41,937  37,988 
  South America 13,832  16,740 
 Total net sales$181,674 $176,193 
         
 Operating earnings, excluding indirect operating expenses      
  North America$15,711 $15,039 
  EMEA 8,096  6,970 
  Asia/Pacific 9,918  9,628 
  South America 1,509  2,875 
 Total operating earnings, excluding indirect operating expenses 35,234  34,512 
 Indirect operating expenses (15,048)  (16,222) 
 Amortization expense (813)  (879) 
 Consolidated operating income 19,373  17,411 
 Other (expense) income, net (473)  346 
 Interest expense (525)  (744) 
 Interest income 453  169 
 Consolidated income before taxes and equity in net income of associated companies$18,828 $17,182