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Net Income Per Share (Schedule Of Net Income Per Share) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 29, 2013
Sep. 30, 2012
Sep. 29, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Net income $ 14,457 $ 23,791 $ 43,785 $ 70,460
Weighted average shares outstanding: Basic (in shares) 38,700,000 38,162,000 38,562,000 37,978,000
Weighted average shares outstanding: Dilutive potential common shares (in shares) 498,000 640,000 565,000 704,000
Weighted average shares outstanding: Total diluted shares (in shares) 39,198,000 38,802,000 39,127,000 38,682,000
Basic net income per share (in dollars per share) $ 0.37 $ 0.62 $ 1.14 $ 1.86
Diluted net income per share (in dollars per share) $ 0.37 $ 0.61 $ 1.12 $ 1.82
Anti-dilutive common stock options (in shares) 3,000,000 2,600,000 2,800,000 2,700,000