CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 28, 2014		Jun. 29, 2013
Cash flows from operating activities:
Net income (loss)	$ 815		$ (16,148)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Gain on disposal of video camera segment	(4,133)
Operating cash flows of discontinued operations	(694)		1,405
Depreciation and amortization	6,875		6,145
Share-based compensation expense	3,168		2,711
Deferred income taxes	(723)		(794)
Other accrued liabilities	45		394
Changes in current assets and liabilities, excluding effects from acquisitions and divestitures:
Accounts receivable	(11,399)		(1,692)
Inventories	(6,218)		3,049
Other current assets	(554)		1,125
Accounts payable	6,512		2,140
Deferred profit	2,792		4,716
Income taxes payable, including excess stock option exercise benefit	324		861
Accrued compensation, warranty and other liabilities	2,166		(2,488)
Net cash provided by (used in) operating activities	(1,024)		1,424
Cash flows from investing activities, excluding effects from acquisitions and divestitures:
Cash received from sale of video camera segment	9,886
Payment for purchase of Ismeca, net of cash received			(53,463)
Sales and maturities of short-term investments	1,000		632
Purchases of property, plant and equipment	(1,106)		(1,223)
Other assets	(102)		(162)
Investing cash flows of discontinued operations	(6)		(30)
Net cash provided by (used in) investing activities	9,672		(54,246)
Cash flows from financing activities:
Cash dividends paid	(3,011)		(1,478)
Issuance of stock, net of repurchases	139		691
Net cash used in financing activities	(2,872)		(787)
Effect of exchange rate changes on cash and cash equivalents	525		(1,759)
Net decrease in cash and cash equivalents	6,301		(55,368)
Cash and cash equivalents at beginning of period	51,668	[1]	102,808
Cash and cash equivalents at end of period	57,969		47,440
Supplemental disclosure of cash flow information:
Cash paid (refunded) for income taxes	591		(1,321)
Inventory capitalized as property, plant and equipment	142		572
Dividends declared but not yet paid	$ 1,524		$ 1,494

[1] Derived from December 28, 2013 audited financial statements