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Fair Value Measurements (Tables)
6 Months Ended
Jun. 29, 2013
Fair Value Measurements [Abstract]  
Schedule of Assets and Liabilities at Fair Value
          Fair value measurements at reporting date using:
    Total   Level 1   Level 2   Level 3
        Fair Value       Inputs       Inputs       Inputs
June 29, 2013                        
Assets                        
Assets held in rabbi trusts   $     4,261   $     858   $     3,403   $     -
 
December 31, 2012                        
Assets                        
Assets held in rabbi trusts   $ 4,299   $ 1,102   $ 3,197   $ -