CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS AND RETAINED EARNINGS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 29, 2013		Jun. 30, 2012		Jun. 29, 2013		Jun. 30, 2012
CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS AND RETAINED EARNINGS
Net product sales	$ 101,988		$ 108,156		$ 212,267		$ 217,919
Rental and royalty revenue	898		983		1,905		2,040
Total revenue	102,886		109,139		214,172		219,959
Product cost of goods sold	66,972		72,858		139,141		147,763
Rental and royalty cost	225		250		475		507
Total costs	67,197		73,108		139,616		148,270
Product gross margin	35,016		35,298		73,126		70,156
Rental and royalty gross margin	673		733		1,430		1,533
Total gross margin	35,689		36,031		74,556		71,689
Selling, marketing and administrative expenses	26,487		25,022		54,454		52,261
Earnings from operations	9,202		11,009		20,102		19,428
Other income (expense), net	1,705		(444)		4,296		2,891
Earnings before income taxes	10,907		10,565		24,398		22,319
Provision for income taxes	2,538		3,054		6,960		6,034
Net earnings	8,369		7,511		17,438		16,285
Net earnings per share (in dollars per share)	$ 0.14		$ 0.12		$ 0.29		$ 0.27
Dividends per share (in dollars per share)	$ 0.08	[1]	$ 0.08	[1]	$ 0.16	[1]	$ 0.16	[1]
Average number of shares outstanding (in shares)	59,667		60,652		59,785		60,728
Retained earnings at beginning of period	35,598		80,128		80,210		114,269
Net earnings	8,369		7,511		17,438		16,285
Cash dividends	(4,768)		(4,708)		(9,421)		(9,289)
Stock dividends					(49,028)		(38,334)
Retained earnings at end of period	$ 39,199		$ 82,931		$ 39,199		$ 82,931

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