Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income (loss)	$ (33,418)	$ (12,243)	$ 15,719
Adjustments to reconcile net income (loss) to net cash provided from operating activities:
Depreciation and amortization	13,469	9,403	10,067
Share-based compensation expense	5,468	4,621	4,287
Gain on sale of facility		(677)
Deferred income taxes	(1,657)	581	(1,676)
Accrued retiree benefits	130	(91)	381
Excess tax benefit from stock options exercised			(2)
Changes in current assets and liabilities, excluding effects from acquisitions:
Accounts receivable	(2,502)	4,979	24,877
Inventories	13,052	19,897	(20,865)
Accounts payable	6,658	(5,458)	427
Other current assets	(542)	978	(1,549)
Income taxes payable, including excess stock option exercise benefits	156	(1,667)	(6,462)
Deferred profit	3,833	(682)	(12,013)
Accrued compensation, warranty and other liabilities	(1,230)	(6,472)	(953)
Net cash provided from operating activities	3,417	13,169	12,238
Cash flows from investing activities, excluding effects from acquisitions:
Payment for purchase of Ismeca, net of cash received	(53,463)
Sales and maturities of short-term investments	6,221	84,780	75,657
Purchases of short-term investments		(40,461)	(75,128)
Purchases of property, plant and equipment	(3,908)	(3,267)	(1,413)
Cash received from facility sale		1,080
Cash paid for Duma Video, Inc.		(900)
Other assets	(176)	(66)	78
Net cash provided from (used for) investing activities	(51,326)	41,166	(806)
Cash flows from financing activities:
Cash dividends paid	(4,468)	(7,333)	(5,777)
Issuance of stock, net	1,316	1,570	1,911
Excess tax benefit from stock options exercised			2
Net cash used for financing activities	(3,152)	(5,763)	(3,864)
Effect of exchange rate changes on cash and cash equivalents	(79)	974	(227)
Net increase in cash and cash equivalents	(51,140)	49,546	7,341
Cash and cash equivalents at beginning of year	102,808	53,262	45,921
Cash and cash equivalents at end of year	51,668	102,808	53,262
Cash paid (refunded) during the year for:
Income taxes	(900)	711	10,203
Inventory capitalized as capital assets	657	567	1,380
Dividends declared but not yet paid	$ 1,504		$ 1,455