Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 24, 2011		Sep. 25, 2010
Cash flows from operating activities:
Net income	$ 15,000		$ 15,216
Adjustments to reconcile net income to net cash provided from operating activities:
Depreciation and amortization	7,596		8,136
Share-based compensation expense	2,909		2,543
Deferred income taxes	(1,413)		(1,305)
Other accrued liabilities	207		166
Excess tax benefits from stock options exercised	(70)		(155)
Changes in current assets and liabilities:
Accounts receivable	16,762		(23,754)
Inventories	(21,873)		(15,499)
Other current assets	(150)		4,106
Accounts payable	4,267		5,234
Customer advances	(193)		(70)
Deferred profit	(9,083)		8,277
Income taxes payable, including excess stock option exercise benefit	(6,275)		7,162
Accrued compensation, warranty and other liabilities	(1,149)		1,045
Net cash provided by operating activities	6,535		11,102
Cash flows from investing activities:
Purchases of short-term investments	(48,530)		(42,903)
Sales and maturities of short-term investments	50,236		31,158
Purchases of property, plant and equipment	(1,290)		(3,386)
Other assets	(59)		232
Net cash provided by (used in) investing activities	357		(14,899)
Cash flows from financing activities:
Issuance of stock, net of repurchases	1,534		2,896
Excess tax benefits from stock options exercised	70		155
Cash dividends	(4,327)		(4,247)
Net cash used in financing activities	(2,723)		(1,196)
Effect of exchange rate changes on cash	1,056		(409)
Net increase (decrease) in cash and cash equivalents	5,225		(5,402)
Cash and cash equivalents at beginning of period	45,921	[1]	38,247
Cash and cash equivalents at end of period	51,146		32,845
Supplemental disclosure of cash flow information:
Cash paid (refunded) for income taxes	9,573		(3,321)
Inventory capitalized as property, plant and equipment	966		1,827
Dividends declared but not yet paid	$ 1,450		$ 1,432

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