Discontinued Operations (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016	Jan. 01, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	$ 8,249	$ 36,458	$ 44,343	$ 77,224
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net	0		0		$ 28,400
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	141,343	6,101	143,884	11,823
(Loss) income from discontinued operations before income taxes	(3,109)	4,927	650	13,117
Pre-tax gain (loss) on disposal of business unit	180,377	(8)	180,377	(11)
Discontinued Operation, Tax Effect of Discontinued Operation	35,925	(1,182)	37,143	1,283
Disposal Group, Including Discontinued Operation, Inventory, Current	0		0		26,977
Disposal Group, Including Discontinued Operation, Prepaid income taxes, Current	0		0		425
Disposal Group, Including Discontinued Operation, Other Assets, Current	0		0		3,183
Disposal Group, Including Discontinued Operation, Assets, Current	0		0		58,985
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent	0		0		25,219
Disposal Group, Including Discontinued Operation, Intangible Assets, Noncurrent	0		0		3,292
Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent	0		0		38,794
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent	0		0		1,084
Long-term assets of discontinued operations	0		0		68,389
Disposal Group, Including Discontinued Operation, Assets	0		0		127,374
Disposal Group, Including Discontinued Operation, Accounts Payable, Current	0		0		16,770
Disposal Group, Including Discontinued Operation, Accrued restructuring and contract termination charges, Current	0		0		209
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current	6,373		6,373		9,992
Current liabilities of discontinued operations	6,373		6,373		26,971
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities, Noncurrent	0		0		7,851
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent	0		0		7,109
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent	0		0		14,960
Disposal Group, Including Discontinued Operation, Liabilities	6,373		6,373		41,931
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	8,138	24,729	32,933	50,484
Disposal Group, Including Discontinued Operation, General and Administrative Expense	1,926	3,042	5,869	6,049
Disposal Group, Including Discontinued Operations, Research and development expenses	1,294	3,139	4,891	6,953
Disposal Group, Including Discontinued Operations, Restructuring and contract termination charges, net	0	621	0	621
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	(3,109)	$ 4,927	$ 650	$ 13,117
Medical Imaging Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax gain (loss) on disposal of business unit	180,377
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation	$ 36,776
Disposal Group, Including Discontinued Operation, Consideration					$ 277,400
Discontinued Operation, Period of Continuing Involvement after Disposal	12 months