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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value Measurements  
Fair Value Of Assets And Liabilities Measured On A Recurring Basis
   June 30, December 31,
   2012 2011
Assets:      
 Supplemental executive retirement savings plan investments - Level 2 $ 8,051 $ 6,516
        
Liabilities:      
 Contingent purchase price payable - Level 3 $ 3,100 $ 3,100