Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012		Jun. 25, 2011
Cash flows from operating activities:
Net income (loss)	$ (5,333)		$ 11,624
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	4,876		5,213
Share-based compensation expense	2,295		1,986
Deferred income taxes	(348)		(685)
Other accrued liabilities	99		80
Excess tax benefits from stock options exercised			(62)
Changes in current assets and liabilities:
Accounts receivable	(267)		13,473
Inventories	9,288		(14,025)
Other current assets	593		(822)
Accounts payable	(3,440)		1,142
Deferred profit	1,338		(7,181)
Income taxes payable, including excess stock option exercise benefit	747		(4,884)
Accrued compensation, warranty and other liabilities	(4,002)		(3,179)
Net cash provided by operating activities	5,846		2,680
Cash flows from investing activities:
Purchases of short-term investments	(35,312)		(33,614)
Sales and maturities of short-term investments	39,623		33,828
Purchases of property, plant and equipment	(1,289)		(432)
Other assets	(99)		(50)
Net cash provided by (used in) investing activities	2,923		(268)
Cash flows from financing activities:
Cash dividends	(2,920)		(2,879)
Issuance of stock, net of repurchases	934		1,408
Excess tax benefits from stock options exercised			62
Net cash used in financing activities	(1,986)		(1,409)
Effect of exchange rate changes on cash and cash equivalents	(852)		2,464
Net increase in cash and cash equivalents	5,931		3,467
Cash and cash equivalents at beginning of period	53,262	[1]	45,921
Cash and cash equivalents at end of period	59,193		49,388
Supplemental disclosure of cash flow information:
Cash paid for income taxes	234		8,222
Inventory capitalized as property, plant and equipment	415		762
Dividends declared but not yet paid	$ 1,468		$ 1,442

[1] Derived from December 31, 2011 audited financial statements.