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Supplemental Financial Information (Tables)
12 Months Ended
Dec. 31, 2011
Supplemental Financial Information [Abstract]  
Schedule Of Supplemental Balance Sheet Information
Schedule Of Other Supplemental Information
   2011     2010     2009  

Other supplemental information

      

Rent expense

   $ 589      $ 526      $ 412   

Interest paid

   $ 1,039      $ 1,043      $ 456   

Income taxes paid, net of refunds

   $ 2,218      $ 1,495      $ 1,498