Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 25, 2010
Current assets:
Cash and cash equivalents	$ 53,262	$ 45,921
Short-term investments	51,740	52,254
Accounts receivable, net	41,922	66,801
Inventories:
Raw materials and purchased parts	47,186	34,922
Work in process	15,504	17,470
Finished goods	19,999	10,832
Total inventories	82,689	63,224
Deferred income taxes	6,646	5,991
Other current assets	7,557	6,026
Total current assets	243,816	240,217
Property, plant and equipment, at cost:
Land and land improvements	12,002	12,057
Buildings and building improvements	31,190	31,117
Machinery and equipment	38,007	41,630
Property plant and equipment, gross	81,199	84,804
Less accumulated depreciation and amortization	(44,218)	(45,000)
Net property, plant and equipment	36,981	39,804
Goodwill	58,060	58,498
Intangible assets, net	21,828	26,523
Other assets	923	1,001
Total assets	361,608	366,043
Current liabilities:
Accounts payable	18,625	18,198
Accrued compensation and benefits	12,652	16,944
Accrued warranty	6,801	5,016
Deferred profit	2,821	14,834
Income taxes payable	2,518	8,802
Other accrued liabilities	8,454	7,740
Total current liabilities	51,871	71,534
Other accrued liabilities	5,964	5,931
Deferred income taxes	12,742	13,853
Commitments and contingencies
Stockholders' equity:
Preferred stock, $1 par value; 1,000 shares authorized, none issued
Common stock, $1 par value; 60,000 shares authorized, 24,330 shares issued and outstanding in 2011 and 23,989 shares in 2010	24,330	23,989
Paid-in capital	77,658	71,799
Retained earnings	189,055	179,134
Accumulated other comprehensive loss	(12)	(197)
Total stockholders' equity	291,031	274,725
Total liabilities and stockholders' equity	$ 361,608	$ 366,043