Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 29, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 254,625	$ 341,638
Marketable securities	488,439	586,882
Accounts receivable, less allowance for doubtful accounts of $2,461 and $2,912 at June 29, 2014 and December 31, 2013, respectively	300,767	157,642
Inventories:
Parts	70,444	84,232
Assemblies in process	15,191	15,539
Finished goods	41,239	38,168
Inventory, Net, Total	126,874	137,939
Deferred tax assets	68,460	72,478
Prepayments	110,473	136,374
Other current assets	4,989	7,324
Total current assets	1,354,627	1,440,277
Net property, plant and equipment	308,521	275,236
Marketable securities	364,077	271,078
Deferred tax assets	5,810	5,217
Other assets	10,927	14,591
Retirement plans assets	9,134	9,342
Intangible assets, net	215,748	252,291
Goodwill	361,819	361,792
Total assets	2,630,663	2,629,824
Current liabilities:
Accounts payable	102,214	62,874
Accrued employees' compensation and withholdings	86,765	95,619
Deferred revenue and customer advances	63,968	55,404
Other accrued liabilities	93,103	63,712
Accrued income taxes	15,182	11,360
Current debt		186,663
Total current liabilities	361,232	475,632
Long-term deferred revenue and customer advances	18,992	13,756
Retirement plans liabilities	92,485	91,517
Deferred tax liabilities	39,616	40,686
Long-term other accrued liabilities	16,865	23,139
Total liabilities	529,190	644,730
Commitments and contingencies (Note O)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized, 196,321 shares and 191,731 shares issued and outstanding at June 29, 2014 and December 31, 2013, respectively	24,540	23,966
Additional paid-in capital	1,414,513	1,390,896
Accumulated other comprehensive income	5,709	4,000
Retained earnings	656,711	566,232
Total shareholders' equity	2,101,473	1,985,094
Total liabilities and shareholders' equity	$ 2,630,663	$ 2,629,824