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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Apr. 01, 2012
Apr. 03, 2011
Earnings Per Share Reconciliation    
Basic EPS - net income $ 25,667 $ 22,312
Basic EPS - shares 37,886 38,478
Basic EPS - per share amount $ 0.68 $ 0.58
Dilutive effect of 2.875% convertible debt - net income 455 451
Dilutive effect of 2.875% convertible debt - shares 3,033 3,033
Dilutive effect of 2.875% convertible debt - per share amount $ (0.04) $ (0.03)
Dilutive effect of stock options, restricted stock units, and shares issuable to Philips - net income 0 0
Dilutive effect of stock options, restricted stock units, and shares issuable to Philips - shares 599 590
Dilutive effect of stock options, restricted stock units, and shares issuable to Philips - per share amount $ (0.01) $ (0.01)
Diluted EPS - net income $ 26,122 $ 22,763
Diluted EPS - shares 41,518 42,101
Diluted EPS - per share amount $ 0.63 $ 0.54