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Business Acquisitions (Tables)
9 Months Ended
Sep. 30, 2012
Business Acquisitions [Abstract]  
Unaudited pro forma condensed financial information
                 
   

Three Months Ended

September 30,

   

Nine Months Ended

September 30,

 
    2011     2011  

Revenues

  $ 53,518     $ 158,587  

Net earnings

  $ 305     $ 1,605