CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014	Dec. 28, 2013
Current assets:
Cash and cash equivalents	$ 60,578	$ 51,668	[1]
Short-term investments	1,155	1,200	[1]
Accounts receivable, net	86,545	58,164	[1]
Inventories:
Raw materials and purchased parts	28,824	27,668	[1]
Work in process	22,662	16,941	[1]
Finished goods	8,654	10,800	[1]
Total inventories	60,140	55,409	[1]
Deferred income taxes	5,477	5,516	[1]
Other current assets	7,996	8,619	[1]
Current assets of discontinued video camera segment (Note 2)		6,272	[1]
Total current assets	221,891	186,848	[1]
Property, plant and equipment, at cost:
Land and land improvements	11,932	12,285	[1]
Buildings and building improvements	31,301	31,731	[1]
Machinery and equipment	42,955	42,105	[1]
Property plant and equipment, gross	86,188	86,121	[1]
Less accumulated depreciation and amortization	(52,827)	(50,325)	[1]
Net property, plant and equipment	33,361	35,796	[1]
Goodwill	67,865	71,313	[1]
Intangible assets, net	36,472	45,315	[1]
Other assets	5,783	5,720	[1]
Noncurrent assets of discontinued video camera segment (Note 2)		431	[1]
Total consolidated assets	365,372	345,423	[1]
Current liabilities:
Accounts payable	34,426	25,292	[1]
Accrued compensation and benefits	20,364	14,271	[1]
Accrued warranty	4,963	5,155	[1]
Deferred profit	11,240	6,066	[1]
Income taxes payable	2,264	805	[1]
Other accrued liabilities	8,020	7,675	[1]
Current liabilities of discontinued video camera segment (Note 2)		1,747	[1]
Total current liabilities	81,277	61,011	[1]
Accrued retirement benefits	10,470	10,841	[1]
Noncurrent income tax liabilities	7,289	7,463	[1]
Deferred income taxes	12,005	12,948	[1]
Commitments and contingencies			[1]
Stockholders' equity:
Preferred stock, $1 par value; 1,000 shares authorized, none issued			[1]
Common stock, $1 par value; 60,000 shares authorized, 25,535 shares issued and outstanding in 2014 and 25,080 shares in 2013	25,535	25,080	[1]
Paid-in capital	95,632	89,883	[1]
Retained earnings	135,317	131,546	[1]
Accumulated other comprehensive income (loss)	(2,153)	6,651	[1]
Total stockholders' equity	254,331	253,160	[1]
Total liabilities and stockholders' equity	$ 365,372	$ 345,423	[1]

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