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
NET SALES	$ 359,449	$ 296,755	$ 257,462
COST OF SALES	193,981	168,257	148,660
GROSS PROFIT	165,468	128,498	108,802
OPERATING EXPENSES:
Selling, general, and administrative	104,502	87,615	64,787
Research and development	21,938	15,335	11,168
Acquired in-process research and development	5,838	0	0
Goodwill, Impairment Loss	0	8,344	0
Total operating expenses	132,278	111,294	75,955
INCOME FROM OPERATIONS	33,190	17,204	32,847
OTHER INCOME (EXPENSE):
Interest income	129	34	178
Interest expense	(789)	(596)	(28)
Other income	345	146	97
Other income (expense) - net	(315)	(416)	247
INCOME BEFORE INCOME TAXES	32,875	16,788	33,094
INCOME TAX EXPENSE	9,831	4,328	10,564
Net Income	$ 23,044	$ 12,460	$ 22,530
EARNINGS PER COMMON SHARE:
Earnings Per Share, Basic	$ 0.59	$ 0.35	$ 0.64
Diluted (in dollars per share)	$ 0.58	$ 0.35	$ 0.63
AVERAGE COMMON SHARES:
Basic (in shares)	39,086	35,290	35,014
Diluted (in shares)	39,733	35,976	35,758