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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value Measurements  
Fair Value Of Assets And Liabilities Measured On A Recurring Basis
   March 31, December 31,
   2013 2012
Assets:      
 Supplemental executive retirement savings plan investments - Level 2 $ 11,239 $ 8,804
        
Liabilities:      
 Contingent purchase price payable - Level 3 $ -  $ 2,744