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Borrowings (Components Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 26, 2011
Mar. 31, 2011
Dec. 31, 2010
6.875% Senior Subordinated Notes due 2019 $ 250,000    
Long-term debt 1,025,000   965,800
Subtotal, Long-term debt 949,866   885,909
Less: Current portion of borrowings     (72,500)
Total long-term debt 949,866   813,409
Annual interest rate 6.875%    
Debt maturity date October 1, 2014    
Senior Credit Facility, Term Loan Facility, At An Average Rate Of 1.31%, Due 10/1/2012 [Member]
      
Senior Credit Facility   36,100 36,123
Annual interest rate 1.31%    
Debt maturity date 10/1/2012    
Senior Credit Facility, Term Loan Facility, At An Average Rate Of 2.56%, Due 10/1/2014 [Member]
      
Senior Credit Facility 375,000   363,877
Annual interest rate 2.56%    
Debt maturity date 10/1/2014    
2004 Notes, 6.66% Series 2004-1 Tranche A Senior Notes Due 7/8/2011 [Member]
      
Senior notes     72,500
Annual interest rate 6.66%    
Debt maturity date 7/8/2011    
2004 Notes, 7.14% Series 2004-1 Tranche B Senior Notes Due 7/8/2014 [Member]
      
Senior notes     48,250
Annual interest rate 7.14%    
Debt maturity date 7/8/2014    
2004 Notes, 7.46% Series 2004-1 Tranche C Senior Notes Due 7/8/2016 [Member]
      
Senior notes     45,050
Annual interest rate 7.46%    
Debt maturity date 7/8/2016    
3.875% Convertible Senior Subordinated Notes Due 2017 [Member]
      
3.875% Convertible Senior Subordinated Notes due 2017 400,000   400,000
Less: Unamortized debt discount on 3.875% Convertible Senior Subordinated Notes due 2017 (75,134)   (79,891)
Annual interest rate 3.875%    
Debt maturity date 2017    
6.875% Senior Subordinated Notes Due 2019 [Member]
      
6.875% Senior Subordinated Notes due 2019 $ 250,000    
Annual interest rate 6.875%    
Debt maturity date June 1, 2019