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Borrowings Components of long-term debt (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 28, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Revolving credit facility, at a rate of 1.90% at September 28, 2014, due 7/16/2018 $ 200,000 $ 680,000
5.25% Senior Notes due 2024 250,000 0
Total borrowings 1,099,991 1,330,000
Less: Unamortized debt discount on 3.875% Convertible Senior Subordinated Notes (39,335) (48,413)
Total long-term debt 1,060,656 1,281,587
Current portion of borrowings (360,656) (351,587)
Long-term borrowings 700,000 930,000
3.875% Convertible Senior Subordinated Notes
   
Debt Instrument [Line Items]    
3.875% Convertible Senior Subordinated Notes due 2017 399,991 400,000
6.875% Senior Subordinated Notes due 2019
   
Debt Instrument [Line Items]    
6.875% Senior Subordinated Notes due 2019 $ 250,000 $ 250,000