CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jul. 03, 2016		Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 381,095		$ 264,705
Marketable securities	442,154		477,696
Accounts receivable, less allowance for doubtful accounts of $2,384 and $2,407 at July 3, 2016 and December 31, 2015, respectively	349,547		211,293
Inventories, net:
Parts	57,745		73,117
Assemblies in process	32,536		32,825
Finished goods	38,997		47,646
Inventory, Net, Total	129,278		153,588
Deferred tax assets			54,973
Prepayments	103,131		91,519
Other current assets	7,681		6,194
Total current assets	1,412,886		1,259,968
Property, plant and equipment, net	264,555		273,414
Marketable securities	282,545		265,928
Deferred tax assets	72,708		7,404
Other assets	13,074		13,080
Retirement plans assets	2,811		636
Intangible assets, net	122,069		239,831
Goodwill	237,210		488,413
Total assets	2,407,858	[1]	2,548,674
Current liabilities:
Accounts payable	103,090		92,358
Accrued employees' compensation and withholdings	89,167		113,994
Deferred revenue and customer advances	190,920		85,527
Other accrued liabilities	47,150		43,727
Contingent consideration	1,050		15,500
Accrued income taxes	23,972		21,751
Total current liabilities	455,349		372,857
Long-term deferred revenue and customer advances	26,927		25,745
Retirement plans liabilities	106,618		103,531
Deferred tax liabilities	16,110		26,663
Long-term other accrued liabilities	33,411		32,156
Long-term contingent consideration	23,864		21,936
Total liabilities	662,279		582,888
Commitments and contingencies (See Note P)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized; 202,841 and 203,641 shares issued and outstanding at July 3, 2016 and December 31, 2015, respectively	25,355		25,455
Additional paid-in capital	1,505,863		1,480,647
Accumulated other comprehensive income (loss)	2,293		(8,144)
Retained earnings	212,068		467,828
Total shareholders' equity	1,745,579		1,965,786
Total liabilities and shareholders' equity	$ 2,407,858		$ 2,548,674

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