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Business Acquisitions (Tables)
 12 Months Ended
Dec. 31, 2011
Business Acquisitions [Abstract]  
Purchase Price Allocation
The table below reflects the purchase price allocation (in thousands):

Property, plant and equipment
 $42,268 
Intangible assets
  7,100 
Goodwill
  19,710 
Net working capital
  (14,078)
Total purchase price
 $55,000