CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
NET SALES	$ 394,288	$ 359,449	$ 296,755
COST OF SALES	212,296	193,981	168,257
GROSS PROFIT	181,992	165,468	128,498
OPERATING EXPENSES:
Selling, general, and administrative	122,106	104,502	87,615
Research and development	27,795	21,938	15,335
Acquired in-process research and development	2,450	5,838	0
Goodwill impairment charge	0	0	8,344
Total operating expenses	152,351	132,278	111,294
INCOME FROM OPERATIONS	29,641	33,190	17,204
OTHER INCOME (EXPENSE):
Interest income	226	129	34
Interest expense	(604)	(789)	(596)
Other income (expense)	(1,645)	345	146
Other income (expense) — net	(2,023)	(315)	(416)
INCOME BEFORE INCOME TAXES	27,618	32,875	16,788
INCOME TAX EXPENSE	7,908	9,831	4,328
NET INCOME	$ 19,710	$ 23,044	$ 12,460
EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ 0.47	$ 0.59	$ 0.35
Diluted (in dollars per share)	$ 0.46	$ 0.58	$ 0.35
AVERAGE COMMON SHARES:
Basic (in shares)	42,176	39,086	35,290
Diluted (in shares)	42,610	39,733	35,976