Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
REVENUES:
Net sales	$ 313,056	$ 316,322	$ 301,642
Other	660	547	553
TOTAL REVENUE	313,716	316,869	302,195
COST OF GOODS SOLD	158,984	160,359	159,841
Gross profit	154,732	156,510	142,354
OPERATING EXPENSES:
Selling, general and administrative	90,376	84,604	85,287
Research and development	12,407	10,630	8,588
Legal settlement	0	0	(2,500)
Gain on sale of assets	0	0	(14,242)
Total operating expenses	102,783	95,234	77,133
Income from operations	51,949	61,276	65,221
OTHER INCOME	765	563	1,201
Income before income taxes	52,714	61,839	66,422
PROVISION FOR INCOME TAXES	(12,296)	(20,558)	(21,753)
NET INCOME	$ 40,418	$ 41,281	$ 44,669
NET INCOME PER SHARE
Basic	$ 2.75	$ 2.90	$ 3.23
Diluted	$ 2.65	$ 2.80	$ 3.15
WEIGHTED AVERAGE NUMBER OF SHARES
Basic (in shares)	14,688	14,223	13,835
Diluted (in shares)	15,274	14,725	14,161