CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 75,630	$ 53,262	[1]
Short-term investments	34,481	51,740	[1]
Accounts receivable, net	43,621	41,922	[1]
Inventories:
Raw materials and purchased parts	41,193	47,186	[1]
Work in process	15,044	15,504	[1]
Finished goods	12,448	19,999	[1]
Total inventories	68,685	82,689	[1]
Deferred income taxes	5,694	6,646	[1]
Other current assets	6,278	7,557	[1]
Total current assets	234,389	243,816	[1]
Property, plant and equipment, at cost:
Land and land improvements	12,002	12,002	[1]
Buildings and building improvements	31,043	31,190	[1]
Machinery and equipment	39,722	38,007	[1]
Property plant and equipment, gross	82,767	81,199	[1]
Less accumulated depreciation and amortization	(47,098)	(44,218)	[1]
Net property, plant and equipment	35,669	36,981	[1]
Goodwill	57,957	58,060	[1]
Intangible assets, net	19,611	21,828	[1]
Other assets	949	923	[1]
Total consolidated assets	348,575	361,608	[1]
Current liabilities:
Accounts payable	18,430	18,625	[1]
Accrued compensation and benefits	11,902	12,652	[1]
Accrued warranty	5,600	6,801	[1]
Deferred profit	1,802	2,821	[1]
Income taxes payable	2,565	2,518	[1]
Other accrued liabilities	6,709	8,454	[1]
Total current liabilities	47,008	51,871	[1]
Other accrued liabilities	6,037	5,964	[1]
Deferred income taxes	11,917	12,742	[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, 24,483 shares issued and outstanding in 2012 and 24,330 shares in 2011	24,483	24,330	[1]
Paid-in capital	81,727	77,658	[1]
Retained earnings	177,574	189,055	[1]
Accumulated other comprehensive loss	(171)	(12)	[1]
Total stockholders' equity	283,613	291,031	[1]
Total liabilities and stockholders' equity	$ 348,575	$ 361,608	[1]

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