CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 29, 2012		Sep. 24, 2011
Cash flows from operating activities:
Net income (loss)	$ (7,082)		$ 15,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Gain on sale of facility	(677)
Depreciation and amortization	7,088		7,596
Share-based compensation expense	3,254		2,909
Deferred income taxes	(262)		(1,413)
Other accrued liabilities	158		207
Excess tax benefits from stock options exercised			(70)
Changes in current assets and liabilities:
Accounts receivable	(1,656)		16,762
Inventories	13,468		(21,873)
Other current assets	1,455		(343)
Accounts payable	(245)		4,267
Deferred profit	(1,019)		(9,083)
Income taxes payable, including excess stock option exercise benefit	(33)		(6,275)
Accrued compensation, warranty and other liabilities	(3,662)		(1,149)
Net cash provided by operating activities	10,787		6,535
Cash flows from investing activities excluding effects from acquisitions:
Sales and maturities of short-term investments	57,720		50,236
Purchases of short-term investments	(40,461)		(48,530)
Purchases of property, plant and equipment	(2,416)		(1,290)
Cash received from facility sale	1,080
Cash paid for Duma Video, Inc.	(900)
Other assets	(44)		(59)
Net cash provided by investing activities	14,979		357
Cash flows from financing activities:
Cash dividends	(4,388)		(4,327)
Issuance of stock, net of repurchases	1,048		1,534
Excess tax benefits from stock options exercised			70
Net cash used in financing activities	(3,340)		(2,723)
Effect of exchange rate changes on cash and cash equivalents	(58)		1,056
Net increase in cash and cash equivalents	22,368		5,225
Cash and cash equivalents at beginning of period	53,262	[1]	45,921
Cash and cash equivalents at end of period	75,630		51,146
Supplemental disclosure of cash flow information:
Cash paid for income taxes	833		9,573
Inventory capitalized as property, plant and equipment	567		966
Dividends declared but not yet paid	$ 1,468		$ 1,450

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