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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Earnings Per Share Reconciliation    
Basic EPS - net income $ 26,801 $ 25,667
Basic EPS - shares 38,522 37,886
Basic EPS - per share amount $ 0.70 $ 0.68
Dilutive effect of 2.875% convertible debt - net income 455 455
Dilutive effect of 2.875% convertible debt - shares 3,033 3,033
Dilutive effect of 2.875% convertible debt - per share amount $ (0.04) $ (0.04)
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 581 599
Dilutive effect of stock options, restricted stock units, and shares issuable to Philips - per share amount $ (0.01) $ (0.01)
Diluted EPS - net income $ 27,256 $ 26,122
Diluted EPS - shares 42,136 41,518
Diluted EPS - per share amount $ 0.65 $ 0.63