Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Condensed Consolidated Statements of Operations
Net sales	$ 97,435	$ 136,547	$ 159,216	$ 276,456
Cost of sales	62,795	75,293	102,024	149,934
Gross profit	34,640	61,254	57,192	126,522
Operating expenses (income):
Selling, general and administrative	19,779	20,893	39,427	40,666
Research and development	20,870	23,910	41,607	47,216
Amortization	855	1,185	1,711	2,400
Restructuring			531	63
Other, net	(52)	146	352	111
Total operating expenses	41,452	46,134	83,628	90,456
Operating (loss) income	(6,812)	15,120	(26,436)	36,066
Interest income, net	236	329	428	532
Income (loss) from continuing operations before income taxes	(6,576)	15,449	(26,008)	36,598
Income tax (benefit) provision	(2,495)	4,438	(11,856)	9,125
(Loss) income from continuing operations	(4,081)	11,011	(14,152)	27,473
Discontinued operations:
Income from discontinued operations before income taxes		1,219		1,138
Income tax provision		412		381
Income from discontinued operations		807		757
Net (loss) income	$ (4,081)	$ 11,818	$ (14,152)	$ 28,230
Basic:
Continuing operations (in dollars per share)	$ (0.11)	$ 0.29	$ (0.37)	$ 0.72
Discontinued operations (in dollars per share)		$ 0.02		$ 0.02
(Loss) income (in dollars per share)	$ (0.11)	$ 0.31	$ (0.37)	$ 0.74
Diluted :
Continuing operations (in dollars per share)	$ (0.11)	$ 0.28	$ (0.37)	$ 0.71
Discontinued operations (in dollars per share)		$ 0.02		$ 0.02
(Loss) income (in dollars per share)	$ (0.11)	$ 0.30	$ (0.37)	$ 0.73
Weighted average shares outstanding:
Basic (in shares)	38,764	38,370	38,740	38,315
Diluted (in shares)	38,764	38,988	38,740	38,925