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Segment Reporting (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Segment Reporting Information [Line Items]          
Revenue, Net $ 167,009 $ 160,824 $ 322,920 $ 301,539  
Operating Income 14,325 13,706 25,318 23,047  
Goodwill 31,558 35,636 31,558 35,636 31,751
Total Identifiable Assets 436,614 434,527 436,614 434,527 380,935
Industrial
          
Segment Reporting Information [Line Items]          
Revenue, Net 70,137 59,321 134,869 108,354  
Operating Income 6,249 4,675 11,088 8,102  
Goodwill 13,331 13,447 13,331 13,447  
Total Identifiable Assets 159,236 130,659 159,236 130,659  
Agricultural
          
Segment Reporting Information [Line Items]          
Revenue, Net 53,081 55,470 101,352 105,209  
Operating Income 5,457 5,831 8,760 8,771  
Goodwill 0 0 0 0  
Total Identifiable Assets 136,328 151,914 136,328 151,914  
European
          
Segment Reporting Information [Line Items]          
Revenue, Net 43,791 46,033 86,699 87,976  
Operating Income 2,619 3,200 5,470 6,174  
Goodwill 18,227 22,189 18,227 22,189  
Total Identifiable Assets $ 141,050 $ 151,954 $ 141,050 $ 151,954