Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 29, 2013		Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 572,868		$ 338,920
Marketable securities	384,334		431,516
Accounts receivable, less allowance for doubtful accounts of $3,562 and $4,118 at September 29, 2013 and December 31, 2012, respectively	209,386		153,423
Inventories:
Parts	70,620		89,598
Assemblies in process	25,923		32,303
Finished goods	26,489		17,509
Inventory, Net, Total	123,032		139,410
Deferred tax assets	83,780		77,305
Prepayments	109,107		90,931
Other current assets	11,873		4,556
Total current assets	1,494,380		1,236,061
Net property, plant and equipment	275,421		265,782
Long-term marketable securities	202,087		235,872
Other assets	19,763		20,209
Retirement plans assets	5,020		3,282
Intangible assets, net	265,705		318,867
Goodwill	349,272		349,272
Total assets	2,611,648		2,429,345
Current liabilities:
Accounts payable	67,734		58,324
Accrued employees' compensation and withholdings	78,616		86,264
Deferred revenue and customer advances	70,367		81,357
Other accrued liabilities	62,184		57,249
Accrued income taxes	25,249		12,306
Current debt	183,573		2,328
Total current liabilities	487,723		297,828
Long-term deferred revenue and customer advances	17,455		16,227
Retirement plans liabilities	95,982		94,373
Deferred tax liabilities	37,632		50,201
Long-term other accrued liabilities	21,355		21,302
Long-term debt			171,059
Total liabilities	660,147		650,990
Commitments and contingencies (Note N)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized, 191,399 shares and 187,908 shares issued and outstanding at September 29, 2013 and December 31, 2012, respectively	23,925		23,488
Additional paid-in capital	1,379,832		1,347,762
Accumulated other comprehensive income	3,855	[1]	5,820	[1]
Retained earnings	543,889		401,285
Total shareholders' equity	1,951,501		1,778,355
Total liabilities and shareholders' equity	$ 2,611,648		$ 2,429,345

[1] Net of tax of $835 for unrealized gains on marketable securities and $(125) for retirement plans prior service credit.