CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS, COMPREHENSIVE EARNINGS AND RETAINED EARNINGS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2013		Mar. 31, 2012
CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS, COMPREHENSIVE EARNINGS AND RETAINED EARNINGS
Net product sales	$ 110,279		$ 109,763
Rental and royalty revenue	1,007		1,057
Total revenue	111,286		110,820
Product cost of goods sold	72,169		74,905
Rental and royalty cost	250		257
Total costs	72,419		75,162
Product gross margin	38,110		34,858
Rental and royalty gross margin	757		800
Total gross margin	38,867		35,658
Selling, marketing and administrative expenses	27,967		27,239
Earnings from operations	10,900		8,419
Other income, net	2,591		3,335
Earnings before income taxes	13,491		11,754
Provision for income taxes	4,422		2,980
Net earnings	9,069		8,774
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)	59,903		60,800
Other comprehensive income (loss), before tax
Foreign currency translation adjustments	1,122		1,851
Unrealized gains (losses) for the period on investments	(770)		(546)
Less: reclassification adjustment for (gains) losses to net income	0
Unrealized gains (losses) on investments	(770)		(546)
Unrealized gains (losses) for the period on derivatives	(930)		506
Less: reclassification adjustment for (gains) losses to net income	355		(167)
Unrealized gains (losses) on derivatives	(575)		339
Total other comprehensive income (loss), before tax	(223)		1,644
Income tax benefit related to items of other comprehensive income	506		28
Comprehensive earnings	9,352		10,446
Retained earnings at beginning of period	80,210		114,269
Net earnings	9,069		8,774
Cash dividends	(4,653)		(4,581)
Stock dividends	(49,028)		(38,334)
Retained earnings at end of period	$ 35,598		$ 80,128

[1] Does not include 3% stock dividend to shareholders of record on 3/5/13 and 3/6/12.