Condensed Consolidated Income Statements - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 04, 2015	Sep. 28, 2014	Oct. 04, 2015	Sep. 28, 2014
Product revenue	$ 378,325	$ 365,933	$ 1,126,356	$ 1,113,027
Service revenue	185,111	176,116	527,887	515,802
Total revenue	563,436	542,049	1,654,243	1,628,829
Cost of product revenue	193,375	190,041	579,659	580,974
Cost of service revenue	115,458	108,699	332,095	320,849
Total cost of revenue	308,833	298,740	911,754	901,823
Selling, general and administrative expenses	147,728	142,997	440,343	442,687
Research and development expenses	31,095	30,444	95,898	90,175
Restructuring and contract termination charges, net	(118)	11,092	4,838	13,969
Operating income from continuing operations	75,898	58,776	201,410	180,175
Interest and other expense, net	11,944	10,966	32,208	31,219
Income from continuing operations before income taxes	63,954	47,810	169,202	148,956
Provision for income taxes	9,057	4,912	24,998	19,104
Income from continuing operations	54,897	42,898	144,204	129,852
Gain (loss) from discontinued operations before income taxes	8	(1,091)	6	(4,205)
Loss on disposition of discontinued operations before income taxes	(3)	(7)	(26)	(381)
Provision for (benefit from) income taxes on discontinued operations and dispositions	39	(477)	13	(1,725)
Loss from discontinued operations and dispositions	(34)	(621)	(33)	(2,861)
Net income	$ 54,863	$ 42,277	$ 144,171	$ 126,991
Basic earnings (loss) per share:
Income (loss) from continuing operations (per share)	$ 0.49	$ 0.38	$ 1.28	$ 1.15
Gain (loss) on discontinued operations and dispositions (per share)	0.00	(0.01)	0.00	(0.03)
Net income (per share)	0.49	0.38	1.28	1.13
Diluted earnings (loss) per share:
Income (loss) from continuing operations (per share)	0.48	0.38	1.27	1.14
Gain (loss) on discontinued operations and dispositions (per share)	0.00	(0.01)	0.00	(0.03)
Net income (per share)	$ 0.48	$ 0.37	$ 1.27	$ 1.12
Weighted average shares of common stock outstanding:
Basic (in shares)	112,632	112,646	112,763	112,662
Diluted (in shares)	113,422	113,759	113,565	113,836
Cash dividends per common share	$ 0.07	$ 0.07	$ 0.21	$ 0.21