Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Condensed Consolidated Statements of Operations [Abstract]
SALES	$ 128,498	$ 140,966	$ 404,304	$ 310,760
COST OF SALES	79,651	80,276	238,035	176,304
GROSS PROFIT	48,847	60,690	166,269	134,456
OPERATING EXPENSES:
Research and development	17,592	16,672	50,591	41,329
Selling, general and administrative	16,473	20,545	57,379	49,955
Amortization of intangible assets	989	1,177	2,831	1,945
Restructuring charges	3,119		3,119
Total operating expenses	38,173	38,394	113,920	93,229
OPERATING INCOME	10,674	22,296	52,349	41,227
OTHER INCOME (LOSS), NET	(259)	1,224	496	1,828
Income from continuing operations before income taxes	10,415	23,520	52,845	43,055
Provision for income taxes	3,244	5,964	13,396	9,192
INCOME FROM CONTINUING OPERATIONS, NET OF INCOME TAXES	7,171	17,556	39,449	33,863
Income (loss) from discontinued operations, net of income taxes	(579)	2,392	(365)	5,921
NET INCOME	$ 6,592	$ 19,948	$ 39,084	$ 39,784
Basic weighted-average common shares outstanding	43,535	43,254	43,515	42,711
Diluted weighted-average common shares outstanding	43,819	43,849	44,056	43,293
CONTINUING OPERATIONS:
BASIC EARNINGS PER SHARE	$ 0.16	$ 0.41	$ 0.91	$ 0.79
DILUTED EARNINGS PER SHARE	$ 0.16	$ 0.40	$ 0.90	$ 0.78
DISCONTINUED OPERATIONS:
BASIC EARNINGS PER SHARE	$ (0.01)	$ 0.06	$ (0.01)	$ 0.14
DILUTED EARNINGS PER SHARE	$ (0.01)	$ 0.05	$ (0.01)	$ 0.14
NET INCOME:
BASIC EARNINGS PER SHARE	$ 0.15	$ 0.46	$ 0.90	$ 0.93
DILUTED EARNINGS PER SHARE	$ 0.15	$ 0.45	$ 0.89	$ 0.92