Condensed Consolidated Balance Sheets (USD $) In Thousands	Jul. 03, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 455,398	$ 397,737
Marketable securities	453,942	409,061
Accounts receivable, net of allowance for doubtful accounts of $4,097 and $3,752 at July 3, 2011 and December 31, 2010, respectively	207,823	168,756
Inventories:
Parts	90,964	78,109
Assemblies in process	21,039	16,013
Finished goods	29,515	22,719
Inventory, net, total	141,518	116,841
Deferred tax assets	22,801	22,730
Prepayments and other current assets	61,946	52,780
Current assets from discontinued operations		8,713
Total current assets	1,343,428	1,176,618
Property, plant and equipment, at cost	795,778	773,374
Less: accumulated depreciation	562,346	542,266
Net property, plant and equipment	233,432	231,108
Long-term marketable securities	281,978	248,696
Retirement plan assets	14,456	13,981
Intangible assets, net	108,357	122,941
Other assets	16,644	16,542
Long-term assets from discontinued operations		469
Total assets	1,998,295	1,810,355
Current liabilities:
Accounts payable	106,993	81,142
Accrued employees' compensation and withholdings	75,018	105,374
Deferred revenue and customer advances	98,723	105,568
Other accrued liabilities	59,889	57,145
Accrued income taxes	9,888	8,465
Current debt	2,475	2,450
Current liabilities from discontinued operations		3,560
Total current liabilities	352,986	363,704
Long-term deferred revenue and customer advances	50,064	71,558
Retirement plan liabilities	77,154	72,071
Deferred tax liabilities	9,973	9,849
Long-term other accrued liabilities	19,359	19,448
Long-term debt	154,821	150,182
Long-term liabilities of discontinued operations		1,355
Total liabilities	664,357	688,167
Commitments and contingencies (Note O)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized, 186,002 shares and 182,035 shares issued and outstanding at July 3, 2011 and December 31, 2010, respectively	23,250	22,755
Additional paid-in capital	1,292,727	1,269,525
Accumulated other comprehensive loss	(124,094)	(128,216)
Retained earnings (accumulated deficit)	142,055	(41,876)
Total shareholders' equity	1,333,938	1,122,188
Total liabilities and shareholders' equity	$ 1,998,295	$ 1,810,355