CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Consolidated Statements of Earnings [Abstract]
Net Sales	$ 199,493	$ 201,259	$ 373,205	$ 373,849
Cost of Sales	110,542	117,791	208,935	218,450
Gross Profit	88,951	83,468	164,270	155,399
Operating Expense:
Research and Development Expense	6,935	6,717	14,205	12,997
Selling and Administrative Expense	60,419	66,513	120,133	123,973
Total Operating Expense	67,354	73,230	134,338	136,970
Profit from Operations	21,597	10,238	29,932	18,429
Other Income (Expense):
Interest Income	330	184	642	252
Interest Expense	669	545	1,381	960
Net Foreign Currency Transaction (Losses) Gains	(880)	913	(1,111)	1,440
Other Income (Expense), Net	41	(65)	76	(33)
Total Other (Expense) Income, Net	(1,178)	487	(1,774)	699
Profit Before Income Taxes	20,419	10,725	28,158	19,128
Income Tax Expense	6,748	4,870	9,163	7,407
Net Earnings	$ 13,671	$ 5,855	$ 18,995	$ 11,721
Earnings per Share:
Basic	$ 0.74	$ 0.31	$ 1.02	$ 0.62
Diluted	$ 0.71	$ 0.30	$ 0.99	$ 0.60
Weighted Average Shares Outstanding:
Basic	18,594,207	18,941,131	18,658,182	18,952,093
Diluted	19,203,563	19,467,553	19,262,469	19,491,056
Cash Dividend Declared per Common Share	$ 0.17	$ 0.17	$ 0.34	$ 0.34