Condensed Consolidated Income Statements - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 02, 2017	Apr. 03, 2016
Product revenue	$ 333,714	$ 324,353
Service revenue	180,401	173,663
Total revenue	514,115	498,016
Cost of product revenue	163,169	154,828
Cost of service revenue	111,335	108,102
Total cost of revenue	274,504	262,930
Selling, general and administrative expenses	145,093	144,538
Research and development expenses	33,288	29,971
Restructuring and contract termination charges, net	9,651	0
Operating income from continuing operations	51,579	60,577
Interest and other expense, net	11,596	11,086
Income from continuing operations before income taxes	39,983	49,491
Provision for income taxes	3,921	7,747
Income from continuing operations	36,062	41,744
Income from discontinued operations before income taxes	3,759	8,190
Loss on disposition of discontinued operations before income taxes	0	(3)
Provision for income taxes on discontinued operations and dispositions	1,218	2,465
Income from discontinued operations and dispositions	2,541	5,722
Net income	$ 38,603	$ 47,466
Basic earnings (loss) per share:
Income (loss) from continuing operations (per share)	$ 0.33	$ 0.38
Gain (loss) on discontinued operations and dispositions (per share)	0.02	0.05
Net income (per share)	0.35	0.43
Diluted earnings (loss) per share:
Income (loss) from continuing operations (per share)	0.33	0.38
Gain (loss) on discontinued operations and dispositions (per share)	0.02	0.05
Net income (per share)	$ 0.35	$ 0.43
Weighted average shares of common stock outstanding:
Basic (in shares)	109,468	110,409
Diluted (in shares)	110,204	111,195
Cash dividends per common share	$ 0.07	$ 0.07