CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Oct. 04, 2015		Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 294,217		$ 294,256
Marketable securities	525,381		533,787
Accounts receivable, less allowance for doubtful accounts of $2,418 and $2,491 at October 4, 2015 and December 31, 2014, respectively	245,233		151,034
Inventories, net:
Parts	85,713		70,821
Assemblies in process	15,885		10,347
Finished goods	26,834		23,961
Inventory, Net, Total	128,432		105,129
Deferred tax assets	58,480		57,239
Prepayments	80,779		95,819
Other current assets	4,135		6,582
Total current assets	1,336,657		1,243,846
Property, plant and equipment, net	275,089		329,038
Marketable securities	257,560		470,789
Deferred tax assets	6,909		7,494
Other assets	13,096		10,419
Retirement plans assets	13,933		12,896
Intangible assets, net	260,294		190,600
Goodwill	498,346		273,438
Total assets	2,661,884	[1]	2,538,520
Current liabilities:
Accounts payable	81,642		47,763
Accrued employees' compensation and withholdings	98,252		100,994
Deferred revenue and customer advances	74,318		71,603
Other accrued liabilities	83,823		50,247
Contingent consideration	14,447		895
Accrued income taxes	43,259		20,049
Total current liabilities	395,741		291,551
Long-term deferred revenue and customer advances	29,490		19,929
Retirement plans liabilities	107,102		108,460
Deferred tax liabilities	35,494		23,315
Long-term other accrued liabilities	28,304		13,830
Long-term contingent consideration	20,148		2,455
Total liabilities	$ 616,279		$ 459,540
Commitments and contingencies (See Note P)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized; 207,240 shares and 216,613 shares issued and outstanding at October 4, 2015 and December 31, 2014, respectively	$ 25,904		$ 27,077
Additional paid-in capital	1,471,641		1,437,135
Accumulated other comprehensive income	67		4,689
Retained earnings	547,993		610,079
Total shareholders' equity	2,045,605		2,078,980
Total liabilities and shareholders' equity	$ 2,661,884		$ 2,538,520

[1] Total business assets are directly attributable to each business. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.