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Business Combinations (Details) (USD $)
3 Months Ended 6 Months Ended
Dec. 31, 2011
Jun. 30, 2012
Brazilian joint venture [Member]
Jun. 30, 2012
Trade Names [Member]
Jun. 30, 2012
Customer Contact Lists [Member]
Dec. 31, 2011
Protec Technology and Machinery [Member]
Dec. 31, 2011
GEFCO and STECO Divisions of Blue Tee [Member]
Business Acquisition [Line Items]            
Cost of acquisitions         $ 3,000,000 $ 30,407,000
Original estimate of amortizable intangible assets purchased 3,877,000          
Weighted average useful life of intangible assets (in years)     15 years 8 years    
Amount funded to joint venture   5,000,000        
Expected investment in joint venture   12,000,000        
Ownership percentage (in hundredth)   75.00%        
Expected cost to construct manufacturing facility   $ 20,000,000