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Segment Reporting (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Revenue, Net $ 158,429 $ 155,911  
Operating Income 9,739 10,993  
Goodwill 30,870 32,365 31,648
Total Identifiable Assets 427,240 451,792 404,339
Industrial
      
Segment Reporting Information [Line Items]      
Revenue, Net 69,334 64,732  
Operating Income 5,197 4,838  
Goodwill 13,328 13,400  
Total Identifiable Assets 149,005 157,514  
Agricultural
      
Segment Reporting Information [Line Items]      
Revenue, Net 49,636 48,271  
Operating Income 2,636 3,304  
Goodwill 0 0  
Total Identifiable Assets 134,790 146,495  
European
      
Segment Reporting Information [Line Items]      
Revenue, Net 39,459 42,908  
Operating Income 1,906 2,851  
Goodwill 17,542 18,965  
Total Identifiable Assets $ 143,445 $ 147,783