Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 28, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 211,704	$ 341,638
Marketable securities	594,801	586,882
Accounts receivable, less allowance for doubtful accounts of $2,438 and $2,912 at September 28, 2014 and December 31, 2013, respectively	321,312	157,642
Inventories:
Parts	64,588	84,232
Assemblies in process	11,147	15,539
Finished goods	32,642	38,168
Inventory, Net, Total	108,377	137,939
Deferred tax assets	68,791	72,478
Prepayments	88,732	136,374
Other current assets	7,304	7,324
Total current assets	1,401,021	1,440,277
Net property, plant and equipment	335,805	275,236
Marketable securities	374,808	271,078
Deferred tax assets	5,353	5,217
Other assets	9,853	14,591
Retirement plans assets	8,871	9,342
Intangible assets, net	197,477	252,291
Goodwill	361,819	361,792
Total assets	2,695,007	2,629,824
Current liabilities:
Accounts payable	60,309	62,874
Accrued employees' compensation and withholdings	91,053	95,619
Deferred revenue and customer advances	60,178	55,404
Other accrued liabilities	98,424	63,712
Accrued income taxes	19,840	11,360
Current debt		186,663
Total current liabilities	329,804	475,632
Long-term deferred revenue and customer advances	23,248	13,756
Retirement plans liabilities	88,670	91,517
Deferred tax liabilities	35,911	40,686
Long-term other accrued liabilities	27,466	23,139
Total liabilities	505,099	644,730
Commitments and contingencies (Note O)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized, 216,482 shares and 191,731 shares issued and outstanding at September 28, 2014 and December 31, 2013, respectively	27,060	23,966
Additional paid-in capital	1,431,100	1,390,896
Accumulated other comprehensive income	4,859	4,000
Retained earnings	726,889	566,232
Total shareholders' equity	2,189,908	1,985,094
Total liabilities and shareholders' equity	$ 2,695,007	$ 2,629,824