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Condensed Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net sales $ 139,909 $ 254,676
Cost of sales 74,641 123,713
Gross profit 65,268 130,963
Operating expenses (income):    
Selling, general and administrative 19,773 22,936
Research and development 23,306 19,871
Amortization 1,215 908
Restructuring 63  
Other, net (35) 40
Total operating expenses 44,322 43,755
Operating income 20,946 87,208
Interest (income) expense, net (203) 1,299
Loss on extinguishment of debt   304
Income from continuing operations before income taxes 21,149 85,605
Income tax provision 4,687 27,626
Income from continuing operations 16,462 57,979
Discontinued operations:    
Loss from discontinued operations before income taxes (81) (8,037)
Income tax benefit (31) (2,700)
Loss from discontinued operations (50) (5,337)
Net income $ 16,412 $ 52,642
Basic:    
Continuing operations (in dollars per share) $ 0.43 $ 1.46
Discontinued operations (in dollars per share)   $ (0.14)
Income (in dollars per share) $ 0.43 $ 1.32
Diluted:    
Continuing operations (in dollars per share) $ 0.42 $ 1.36
Discontinued operations (in dollars per share)   $ (0.12)
Income (in dollars per share) $ 0.42 $ 1.24
Weighted average shares outstanding:    
Basic (in shares) 38,261 39,842
Diluted (in shares) 38,863 42,531