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Credit Agreement (Details) (USD $)
 9 Months Ended
Sep. 29, 2012
Dec. 31, 2011
Sep. 24, 2011
Line of Credit Facility [Line Items]      
Senior Credit Facility, maximum borrowing capacity $ 250,000,000    
Senior Credit Facility maturity date Oct. 31, 2016    
Senior Credit Facility amount outstanding 0 0 0
Letters of credit under senior credit facility amount outstanding 41,400,000    
Percentage of additional interest added to LIBOR minimum 0.40%    
Percentage of additional interest added to LIBOR maximum 1.00%    
Percentage of additional interest added to LIBOR 0.50%    
Commitment fee minimum 0.08%    
Commitment fee maximum 0.20%    
Commitment fee for unused capacity 0.10%    
Letters Of Credit [Member]
      
Line of Credit Facility [Line Items]      
Letters of credit maximum borrowing capacity 250,000,000    
Letters of credit under senior credit facility amount outstanding 41,400,000    
Swing Loan [Member]
      
Line of Credit Facility [Line Items]      
Letters of credit maximum borrowing capacity $ 20,000,000