Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 25, 2011		Jun. 26, 2010
Cash flows from operating activities:
Net income	$ 11,624		$ 7,605
Adjustments to reconcile net income to net cash provided from operating activities:
Depreciation and amortization	5,213		5,575
Share-based compensation expense	1,986		1,581
Deferred income taxes	(685)		(676)
Other accrued liabilities	80		40
Excess tax benefits from stock options exercised	(62)		(154)
Changes in current assets and liabilities:
Accounts receivable	13,473		(11,690)
Inventories	(14,025)		(11,224)
Other current assets	(822)		3,504
Accounts payable	1,142		3,720
Customer advances	66		145
Deferred profit	(7,181)		6,385
Income taxes payable, including excess stock option exercise benefit	(4,884)		6,620
Accrued compensation, warranty and other liabilities	(3,245)		(1,966)
Net cash provided by operating activities	2,680		9,465
Cash flows from investing activities:
Purchases of short-term investments	(33,614)		(29,349)
Sales and maturities of short-term investments	33,828		27,273
Purchases of property, plant and equipment	(432)		(1,991)
Other assets	(50)		83
Net cash used in investing activities	(268)		(3,984)
Cash flows from financing activities:
Issuance of stock, net of repurchases	1,408		1,366
Excess tax benefits from stock options exercised	62		154
Cash dividends	(2,879)		(2,824)
Net cash used in financing activities	(1,409)		(1,304)
Effect of exchange rate changes on cash	2,464		(1,294)
Net increase in cash and cash equivalents	3,467		2,883
Cash and cash equivalents at beginning of period	45,921	[1]	38,247
Cash and cash equivalents at end of period	49,388		41,130
Supplemental disclosure of cash flow information:
Cash paid (refunded) for income taxes	8,222		(4,214)
Inventory capitalized as property, plant and equipment	762		1,580
Dividends declared but not yet paid	$ 1,442		$ 1,422

[1] Derived from December 25, 2010 audited financial statements.