CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS, COMPREHENSIVE EARNINGS AND RETAINED EARNINGS (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Apr. 02, 2011
Net product sales	$ 109,763,000		$ 108,323,000
Rental and royalty revenue	1,057,000		1,072,000
Total revenue	110,820,000		109,395,000
Product cost of goods sold	74,905,000		73,524,000
Rental and royalty cost	257,000		270,000
Total costs	75,162,000		73,794,000
Product gross margin	34,858,000		34,799,000
Rental and royalty gross margin	800,000		802,000
Total gross margin	35,658,000		35,601,000
Selling, marketing and administrative expenses	27,239,000		25,964,000
Earnings from operations	8,419,000		9,637,000
Other income, net	3,335,000		2,992,000
Earnings before income taxes	11,754,000		12,629,000
Provision for income taxes	2,980,000		4,299,000
Net earnings	8,774,000		8,330,000
Net earnings per share (in dollars per share)	$ 0.15		$ 0.14
Dividends per share (in dollars per share)	$ 0.08	[1]	$ 0.08	[1]
Average number of shares outstanding (in shares)	59,058		59,806
Other comprehensive income (loss), before tax
Foreign currency translation adjustments	1,851,000		1,002,000
Unrealized losses for the period on investments	(546,000)		(189,000)
Less: reclassification adjustment for losses in net income	0		0
Unrealized losses on investments	(546,000)		(189,000)
Unrealized gains (losses) for the period on derivatives	506,000		(859,000)
Less: reclassification adjustment for losses in net income	(167,000)		(4,394,000)
Unrealized gains (losses) on derivatives	339,000		(5,253,000)
Total other comprehensive income (loss), before tax	1,644,000		(4,440,000)
Income tax benefit related to items of other comprehensive income	28,000		1,921,000
Comprehensive earnings	10,446,000		5,811,000
Retained earnings at beginning of period	114,269,000		135,866,000
Net earnings	8,774,000		8,330,000
Cash dividends	(4,581,000)		(4,512,000)
Stock dividends	(38,334,000)		(47,175,000)
Retained earnings at end of period	$ 80,128,000		$ 92,509,000

[1] Does not include 3% stock dividend to shareholders of record on 3/6/12 and 3/8/11.