CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
NET SALES	$ 95,907	$ 90,477	$ 292,057	$ 268,357
COST OF SALES	50,572	49,423	155,528	145,034
GROSS PROFIT	45,335	41,054	136,529	123,323
OPERATING EXPENSES:
Selling, general, and administrative	28,880	25,708	88,638	76,474
Research and development	7,098	5,401	20,130	15,847
Acquired in-process research and development	275	3,438	2,450	3,438
Total operating expenses	36,253	34,547	111,218	95,759
INCOME FROM OPERATIONS	9,082	6,507	25,311	27,564
OTHER INCOME (EXPENSE):
Interest income	57	36	176	52
Interest expense	(128)	(19)	(352)	(755)
Other income	26	159	633	238
Other (expense) income — net	(45)	176	457	(465)
INCOME BEFORE INCOME TAXES	9,037	6,683	25,768	27,099
INCOME TAX EXPENSE	1,811	2,120	6,699	9,025
NET INCOME	$ 7,226	$ 4,563	$ 19,069	$ 18,074
EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ 0.17	$ 0.11	$ 0.45	$ 0.47
Diluted (in dollars per share)	$ 0.17	$ 0.11	$ 0.45	$ 0.47
AVERAGE COMMON SHARES:
Basic (in shares)	42,202	41,909	42,087	38,123
Diluted (in shares)	42,692	42,502	42,536	38,832