CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS, COMPREHENSIVE EARNINGS AND RETAINED EARNINGS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jul. 02, 2011		Jun. 30, 2012		Jul. 02, 2011
Net product sales	$ 108,156		$ 104,884		$ 217,919		$ 213,207
Rental and royalty revenue	983		936		2,040		2,008
Total revenue	109,139		105,820		219,959		215,215
Product cost of goods sold	72,858		70,986		147,763		144,510
Rental and royalty cost	250		238		507		508
Total costs	73,108		71,224		148,270		145,018
Product gross margin	35,298		33,898		70,156		68,697
Rental and royalty gross margin	733		698		1,533		1,500
Total gross margin	36,031		34,596		71,689		70,197
Selling, marketing and administrative expenses	25,022		26,171		52,261		52,135
Earnings from operations	11,009		8,425		19,428		18,062
Other income (expense), net	(444)		1,001		2,891		3,993
Earnings before income taxes	10,565		9,426		22,319		22,055
Provision for income taxes	3,054		2,940		6,034		7,239
Net earnings	7,511		6,486		16,285		14,816
Net earnings per share (in dollars per share)	$ 0.13		$ 0.11		$ 0.28		$ 0.25
Dividends per share (in dollars per share)	$ 0.08	[1]	$ 0.08	[1]	$ 0.16	[1]	$ 0.16	[1]
Average number of shares outstanding	58,911		59,725		58,987		59,764
Other comprehensive income (loss), before tax
Foreign currency translation adjustments	(1,510)		448		341		1,450
Unrealized gains for the period on investments	514		1,965		(32)		1,776
Less: reclassification adjustment for gains in net earnings	0				0
Unrealized gains on investments	514		1,965		(32)		1,776
Unrealized losses for the period on derivatives	(699)				(193)		(859)
Less: reclassification adjustment for losses in net earnings	(115)		(1,607)		(282)		(6,001)
Unrealized losses on derivatives	(814)		(1,607)		(475)		(6,860)
Total other comprehensive income (loss), before tax	(1,810)		806		(166)		(3,634)
Income tax benefit (expense) related to items of other comprehensive income	181		(174)		209		1,747
Comprehensive earnings	5,882		7,118		16,328		12,929
Retained earnings at beginning of period	80,128		92,509		114,269		135,866
Net earnings	7,511		6,486		16,285		14,816
Cash dividends	(4,708)		(4,629)		(9,289)		(9,141)
Stock dividends					(38,334)		(47,175)
Retained earnings at end of period	$ 82,931		$ 94,366		$ 82,931		$ 94,366

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