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Condensed Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net sales $ 136,547 $ 264,815 $ 276,456 $ 519,491
Cost of sales 75,293 129,466 149,934 253,179
Gross profit 61,254 135,349 126,522 266,312
Operating expenses (income):        
Selling, general and administrative 20,893 27,461 40,666 50,397
Research and development 23,910 23,652 47,216 43,523
Amortization 1,185 1,334 2,400 2,242
Restructuring     63  
Other, net 146 (68) 111 (28)
Total operating expenses 46,134 52,379 90,456 96,134
Operating income 15,120 82,970 36,066 170,178
Interest (income) expense, net (329) 86 (532) 1,385
Loss on extinguishment of debt   3,045   3,349
Income from continuing operations before income taxes 15,449 79,839 36,598 165,444
Income tax provision 4,438 23,521 9,125 51,147
Income from continuing operations 11,011 56,318 27,473 114,297
Discontinued operations:        
Income (loss) from discontinued operations before income taxes 1,219 (59,698) 1,138 (67,735)
Income tax provision (benefit) 412 (22,586) 381 (25,286)
Income (loss) from discontinued operations 807 (37,112) 757 (42,449)
Net income $ 11,818 $ 19,206 $ 28,230 $ 71,848
Basic:        
Continuing operations (in dollars per share) $ 0.29 $ 1.37 $ 0.72 $ 2.83
Discontinued operations (in dollars per share) $ 0.02 $ (0.90) $ 0.02 $ (1.05)
Income (in dollars per share) $ 0.31 $ 0.47 $ 0.74 $ 1.78
Diluted:        
Continuing operations (in dollars per share) $ 0.28 $ 1.31 $ 0.71 $ 2.67
Discontinued operations (in dollars per share) $ 0.02 $ (0.86) $ 0.02 $ (0.99)
Income (in dollars per share) $ 0.30 $ 0.45 $ 0.73 $ 1.68
Weighted average shares outstanding:        
Basic (in shares) 38,370 40,998 38,315 40,433
Diluted (in shares) 38,988 43,002 38,925 42,780