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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value Measurements  
Fair Value Of Assets And Liabilities Measured On A Recurring Basis
    2012 2011
         
Assets:      
 Supplemental executive retirement savings plan investments - Level 2 $ 8,804 $ 6,516
         
Liabilities:      
 Contingent purchase price payable - Level 3 (see note 2) $ 2,744 $ 3,100