CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 03, 2016		Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 319,358		$ 264,705
Marketable securities	410,003		477,696
Accounts receivable, less allowance for doubtful accounts of $2,385 and $2,407 at April 3, 2016 and December 31, 2015, respectively	253,976		211,293
Inventories, net:
Parts	59,425		73,117
Assemblies in process	38,490		32,825
Finished goods	62,772		47,646
Inventory, Net, Total	160,687		153,588
Deferred tax assets			54,973
Prepayments	95,185		91,519
Other current assets	3,513		6,194
Total current assets	1,242,722		1,259,968
Property, plant and equipment, net	266,907		273,414
Marketable securities	246,072		265,928
Deferred tax assets	59,119		7,404
Other assets	13,041		13,080
Retirement plans assets	1,968		636
Intangible assets, net	223,274		239,831
Goodwill	495,871		488,413
Total assets	2,548,974	[1]	2,548,674
Current liabilities:
Accounts payable	84,104		92,358
Accrued employees' compensation and withholdings	71,838		113,994
Deferred revenue and customer advances	72,095		85,527
Other accrued liabilities	92,617		43,727
Contingent consideration	500		15,500
Accrued income taxes	23,368		21,751
Total current liabilities	344,522		372,857
Long-term deferred revenue and customer advances	25,468		25,745
Retirement plans liabilities	106,921		103,531
Deferred tax liabilities	18,300		26,663
Long-term other accrued liabilities	34,753		32,156
Long-term contingent consideration	23,109		21,936
Total liabilities	$ 553,073		$ 582,888
Commitments and contingencies (See Note P)
SHAREHOLDERS' EQUITY
Common stock, $0.125 par value, 1,000,000 shares authorized; 203,707 and 203,641 shares issued and outstanding at April 3, 2016 and December 31, 2015, respectively	$ 25,462		$ 25,455
Additional paid-in capital	1,489,011		1,480,647
Accumulated other comprehensive income (loss)	5,035		(8,144)
Retained earnings	476,393		467,828
Total shareholders' equity	1,995,901		1,965,786
Total liabilities and shareholders' equity	$ 2,548,974		$ 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.