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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Consolidated Statements of Operations      
Net sales $ 331,749 $ 516,020 $ 979,135
Cost of sales 228,607 300,887 504,801
Gross profit 103,142 215,133 474,334
Operating expenses:      
Selling, general and administrative 85,486 73,110 95,134
Research and development 81,424 95,153 96,596
Amortization 5,527 4,908 4,734
Restructuring 1,485 3,813 1,288
Asset impairment 1,220 1,335 584
Total operating expenses 175,142 178,319 198,336
Other, net (1,017) (398) (261)
Changes in contingent consideration 829    
Operating income (loss) (71,812) 37,212 276,259
Interest income 1,200 2,476 3,776
Interest expense (598) (1,502) (4,600)
Interest income (expense), net 602 974 (824)
Loss on extinguishment of debt     (3,349)
Income (loss) from continuing operations before income taxes (71,210) 38,186 272,086
Income tax provision (benefit) (28,947) 11,657 81,584
Income (loss) from continuing operations (42,263) 26,529 190,502
Discontinued operations:      
Income (loss) from discontinued operations before income taxes   6,269 (91,885)
Income tax provision (benefit)   1,870 (29,370)
Income (loss) from discontinued operations   4,399 (62,515)
Net income (loss) $ (42,263) $ 30,928 $ 127,987
Basic:      
Continuing operations (in dollars per share) $ (1.09) $ 0.69 $ 4.80
Discontinued operations (in dollars per share)   $ 0.11 $ (1.57)
Income (loss) (in dollars per share) $ (1.09) $ 0.80 $ 3.23
Diluted :      
Continuing operations (in dollars per share) $ (1.09) $ 0.68 $ 4.63
Discontinued operations (in dollars per share)   $ 0.11 $ (1.52)
Income (loss) (in dollars per share) $ (1.09) $ 0.79 $ 3.11
Weighted average shares outstanding:      
Basic (in shares) 38,807 38,477 39,658
Diluted (in shares) 38,807 39,051 41,155