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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Condensed Consolidated Statements of Operations        
Net sales $ 99,324 $ 132,715 $ 258,540 $ 409,171
Cost of sales 69,016 82,831 171,040 232,765
Gross profit 30,308 49,884 87,500 176,406
Operating expenses (income):        
Selling, general and administrative 19,650 13,892 59,077 54,558
Research and development 18,993 25,775 60,600 72,991
Amortization 855 1,477 2,566 3,877
Restructuring 1,240 2,014 1,771 2,077
Other, net (493) (737) (141) (626)
Total operating expenses 40,245 42,421 123,873 132,877
Operating (loss) income (9,937) 7,463 (36,373) 43,529
Interest income, net 192 176 620 708
(Loss) income from continuing operations before income taxes (9,745) 7,639 (35,753) 44,237
Income tax (benefit) provision (3,719) (59) (15,575) 9,066
(Loss) income from continuing operations (6,026) 7,698 (20,178) 35,171
Discontinued operations:        
Income from discontinued operations before income taxes   5,396   6,534
Income tax provision   1,341   1,722
Income from discontinued operations   4,055   4,812
Net (loss) income $ (6,026) $ 11,753 $ (20,178) $ 39,983
Basic:        
Continuing operations (in dollars per share) $ (0.16) $ 0.20 $ (0.52) $ 0.92
Discontinued operations (in dollars per share)   $ 0.10   $ 0.12
(Loss) income (in dollars per share) $ (0.16) $ 0.30 $ (0.52) $ 1.04
Diluted :        
Continuing operations (in dollars per share) $ (0.16) $ 0.20 $ (0.52) $ 0.90
Discontinued operations (in dollars per share)   $ 0.10   $ 0.13
(Loss) income (in dollars per share) $ (0.16) $ 0.30 $ (0.52) $ 1.03
Weighted average shares outstanding:        
Basic (in shares) 38,841 38,577 38,774 38,402
Diluted (in shares) 38,841 39,169 38,774 39,006