CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Net Sales	$ 200,238	$ 199,493	$ 368,330	$ 373,205
Cost of Sales	112,497	110,542	208,066	208,935
Gross Profit	87,741	88,951	160,264	164,270
Operating Expense:
Research and Development Expense	7,821	6,935	15,339	14,205
Selling and Administrative Expense	58,298	60,419	116,420	120,133
Total Operating Expense	66,119	67,354	131,759	134,338
Profit from Operations	21,622	21,597	28,505	29,932
Other Income (Expense):
Interest Income	114	330	228	642
Interest Expense	(411)	(669)	(878)	(1,381)
Net Foreign Currency Transaction Losses	(419)	(880)	(743)	(1,111)
Other (Expense) Income, Net	(87)	41	(81)	76
Total Other Expense, Net	(803)	(1,178)	(1,474)	(1,774)
Profit Before Income Taxes	20,819	20,419	27,031	28,158
Income Tax Expense	6,565	6,748	7,718	9,163
Net Earnings	$ 14,254	$ 13,671	$ 19,313	$ 18,995
Earnings per Share:
Basic	$ 0.78	$ 0.74	$ 1.06	$ 1.02
Diluted	$ 0.76	$ 0.71	$ 1.03	$ 0.99
Weighted Average Shares Outstanding:
Basic	18,253,326	18,594,207	18,298,379	18,658,182
Diluted	18,787,880	19,203,563	18,835,542	19,262,469
Cash Dividend Declared per Common Share	$ 0.18	$ 0.17	$ 0.36	$ 0.34