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Business Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net Sales by Business Segment    
Net sales $ 34,361 $ 33,026
Engineered Equipment Technology and Parts [Member]
   
Net Sales by Business Segment    
Net sales 25,010 20,890
Engineered Equipment Technology and Parts [Member] | United States [Member]
   
Net Sales by Business Segment    
Net sales 19,195 18,109
Engineered Equipment Technology and Parts [Member] | Netherlands [Member]
   
Net Sales by Business Segment    
Net sales 2,114  
Engineered Equipment Technology and Parts [Member] | Canada [Member]
   
Net Sales by Business Segment    
Net sales 1,747 1,940
Engineered Equipment Technology and Parts [Member] | China [Member]
   
Net Sales by Business Segment    
Net sales 1,954 720
Engineered Equipment Technology and Parts [Member] | Brazil [Member]
   
Net Sales by Business Segment    
Net sales 0 121
Contracting / Services [Member]
   
Net Sales by Business Segment    
Net sales 4,119 7,082
Component Parts [Member]
   
Net Sales by Business Segment    
Net sales 5,059 5,082
Corporate [Member]
   
Net Sales by Business Segment    
Net sales $ 173 $ (28)