CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
NET SALES	$ 449,049	$ 394,288	$ 359,449
COST OF SALES	254,682	212,296	193,981
GROSS PROFIT	194,367	181,992	165,468
OPERATING EXPENSES:
Selling, general, and administrative	128,642	122,106	104,502
Research and development	33,886	27,795	21,938
Intangible asset impairment charges	8,089	0	0
Contingent consideration benefit	(4,094)	0	0
Acquired in-process research and development	0	2,450	5,838
Total operating expenses	166,523	152,351	132,278
INCOME FROM OPERATIONS	27,844	29,641	33,190
OTHER INCOME (EXPENSE):
Interest income	255	226	129
Interest expense	(8,044)	(604)	(789)
Other income (expense) — net	(216)	(1,645)	345
Other expense — net	(8,005)	(2,023)	(315)
INCOME BEFORE INCOME TAXES	19,839	27,618	32,875
INCOME TAX EXPENSE	3,269	7,908	9,831
NET INCOME	$ 16,570	$ 19,710	$ 23,044
EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ 0.39	$ 0.47	$ 0.59
Diluted (in dollars per share)	$ 0.39	$ 0.46	$ 0.58
AVERAGE COMMON SHARES:
Basic (in shares)	42,607	42,176	39,086
Diluted (in shares)	42,884	42,610	39,733