CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Revenues	$ 896,083		$ 878,703		$ 654,301
Cost of goods sold	574,152		527,865		445,721
Gross profit	321,931		350,838		208,580
Operating expenses:
Research, development and engineering	146,902		129,248		109,445
Selling, general and administrative	96,779		96,090		78,399
Litigation expense	19,224		9,360		1,159
Settlement of lawsuit	0		0		2,950
Total operating expenses	262,905		234,698		191,953
Income from operations	59,026		116,140		16,627
Other income (expense):
Interest income	293		376		805
Interest expense	(1,567)		(1,115)		(981)
Foreign currency loss	(262)		(569)		(191)
Recovery (impairment) of investments in other companies	1,363		1,340		(116)
Other, net	119		357		506
Total other (expense) income, net	(54)		389		23
Income before income tax	58,972		116,529		16,650
Income tax expense (benefit)	10,822		(74,308)		405
Net income	$ 48,150		$ 190,837		$ 16,245
Net income per common share:
Basic	$ 0.29	[1]	$ 1.22	[1]	$ 0.11
Diluted	$ 0.28	[1]	$ 1.17	[1]	$ 0.11
Common equivalent shares:
Basic	164,256		155,870		149,759
Diluted	172,510		163,486		152,326

[1] Earnings per share is computed individually for each of the quarters presented; therefore, the sum of the quarterly earnings per share may not necessarily equal the total for the year.