Consolidated Condensed Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net sales	$ 194,316	$ 183,450
Cost of sales	93,405	87,734
Gross profit	100,911	95,716
Selling and administrative expense	74,806	70,078
Research and development expense	7,095	7,681
Other expense	1,988	694
Total operating expenses	83,889	78,453
Income from operations	17,022	17,263
Amortization of debt discount	0	1,094
Interest expense	1,437	1,805
Income before income taxes	15,585	14,364
Provision for income taxes	5,617	5,369
Net income	9,968	8,995
Comprehensive income	$ 11,045	$ 12,024
Per share data:
Basic (dollars per share)	$ 0.36	$ 0.32
Diluted (dollars per share)	$ 0.35	$ 0.31
Dividends per share of common stock (in dollars per share)	$ 0.15	$ 0.00
Weighted average common shares
Basic	28,029	28,261
Diluted	28,484	28,701