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Stock Plans - Share-based Compensation and Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Options Exercisable      
Shares 1,609    
Weighted-Average Exercise Price (in dollars per share) $ 32.95    
Recognized share-based compensation      
Share-based compensation expense before tax $ 18,000 $ 18,813 $ 13,132
Income tax benefit (6,048) (6,011) (4,367)
Net share-based compensation expense 11,952 12,802 8,765
Cost of Sales      
Recognized share-based compensation      
Share-based compensation expense before tax 2,495 2,456 1,446
Selling, General and Administrative Expenses      
Recognized share-based compensation      
Share-based compensation expense before tax 11,474 11,859 8,339
Research and Development Expense      
Recognized share-based compensation      
Share-based compensation expense before tax $ 4,031 $ 4,498 $ 3,347
Stock Options      
Stock option awards, Shares      
Outstanding at the beginning of the period (in shares) 2,391 2,598 2,322
Granted (in shares) 17 509 539
Exercised (in shares) (192) (561) (149)
Expired or forfeited (in shares) (152) (155) (114)
Outstanding at the end of the period (in shares) 2,064 2,391 2,598
Weighted Average Exercise price      
Outstanding at the beginning of the period (in dollars per share) $ 31.65 $ 29.98 $ 28.63
Granted (in dollars per share) 30.22 33.05 32.68
Exercised (in dollars per share) 12.95 23.88 14.74
Expired or terminated (in dollars per share) 38.15 36.22 35.22
Outstanding at the end of the period (in dollars per share) $ 32.91 $ 31.65 $ 29.98