Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
REVENUES:
Net sales	$ 316,322	$ 301,642	$ 282,357
Other	547	553	602
TOTAL REVENUE	316,869	302,195	282,959
COST OF GOODS SOLD	160,359	159,841	153,989
Gross profit	156,510	142,354	128,970
OPERATING EXPENSES:
Selling, general and administrative	84,604	85,287	76,636
Research and development	10,630	8,588	4,678
Legal settlement	0	(2,500)	0
Gain on sale of assets	0	(14,242)	0
Total operating expenses	95,234	77,133	81,314
Income from operations	61,276	65,221	47,656
OTHER INCOME	563	1,201	129
Income before income taxes	61,839	66,422	47,785
PROVISION FOR INCOME TAXES	(20,558)	(21,753)	(17,862)
NET INCOME	$ 41,281	$ 44,669	$ 29,923
NET INCOME PER SHARE
Basic	$ 2.90	$ 3.23	$ 2.20
Diluted	$ 2.80	$ 3.15	$ 2.16
WEIGHTED AVERAGE NUMBER OF SHARES
Basic (in shares)	14,223	13,835	13,611
Diluted (in shares)	14,725	14,161	13,855