CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013
Current assets:
Cash and cash equivalents	$ 57,969	$ 51,668	[1]
Short-term investments	200	1,200	[1]
Accounts receivable, net	69,561	58,164	[1]
Inventories:
Raw materials and purchased parts	29,960	27,668	[1]
Work in process	23,642	16,941	[1]
Finished goods	7,862	10,800	[1]
Total inventories	61,464	55,409	[1]
Deferred income taxes	5,249	5,516	[1]
Other current assets	9,367	8,619	[1]
Current assets of discontinued video camera segment (Note 2)		6,272	[1]
Total current assets	203,810	186,848	[1]
Property, plant and equipment, at cost:
Land and land improvements	12,253	12,285	[1]
Buildings and building improvements	32,001	31,731	[1]
Machinery and equipment	42,684	42,105	[1]
Property plant and equipment, gross	86,938	86,121	[1]
Less accumulated depreciation and amortization	(52,649)	(50,325)	[1]
Net property, plant and equipment	34,289	35,796	[1]
Goodwill	71,075	71,313	[1]
Intangible assets, net	41,101	45,315	[1]
Other assets	5,823	5,720	[1]
Noncurrent assets of discontinued video camera segment (Note 2)		431	[1]
Total consolidated assets	356,098	345,423	[1]
Current liabilities:
Accounts payable	32,156	25,292	[1]
Accrued compensation and benefits	16,931	14,271	[1]
Accrued warranty	4,582	5,155	[1]
Deferred profit	8,858	6,066	[1]
Income taxes payable	1,053	805	[1]
Other accrued liabilities	7,528	7,675	[1]
Current liabilities of discontinued video camera segment (Note 2)		1,747	[1]
Total current liabilities	71,108	61,011	[1]
Accrued retirement benefits	10,976	10,841	[1]
Noncurrent income tax liabilities	7,567	7,463	[1]
Deferred income taxes	12,179	12,948	[1]
Commitments and contingencies			[1]
Stockholders' equity:
Preferred stock, $1 par value; 1,000 shares authorized, none issued	0	0	[1]
Common stock, $1 par value; 60,000 shares authorized, 25,398 shares issued and outstanding in 2014 and 25,080 shares in 2013	25,398	25,080	[1]
Paid-in capital	93,064	89,883	[1]
Retained earnings	129,330	131,546	[1]
Accumulated other comprehensive income	6,476	6,651	[1]
Total stockholders' equity	254,268	253,160	[1]
Total liabilities and stockholders' equity	$ 356,098	$ 345,423	[1]

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