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Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2011
Employee Benefits  
Matching contributions to the Vertex 401(k) Plan

 

 

 
   2011   2010   2009  
 
   (in thousands)
  

Discretionary matching contributions during the year ended December 31,

   $ 8,619   $ 6,552   $ 6,044  

Shares issued during the year ended December 31,

     183     174     198  

Shares issuable as of the year ended December 31,

     62     42     35