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Segment and Geographic Information (Reconciliation of Segment Information) (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2018
Dec. 29, 2017
Dec. 30, 2016
Segment Reporting Information [Line Items]      
Operating income as reported $ 155,555 $ 125,649 $ 92,923
Unallocated other income (expense), net (94,439) (76,390) (64,758)
Income from continuing operations before taxes 61,116 49,259 28,165
Total depreciation and amortization 81,538 81,183 72,868
Total assets 2,326,681 2,848,345  
Expenditures for tangible long-lived assets, excluding acquisitions 41,298 30,340 36,716
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Operating income as reported 239,590 208,547 171,614
Total depreciation and amortization 73,286 74,989 67,874
Total assets 2,240,377 2,741,298  
Expenditures for tangible long-lived assets, excluding acquisitions 35,188 21,557 28,465
Operating Segments [Member] | Medical Segment [Member]      
Segment Reporting Information [Line Items]      
Operating income as reported 224,893 197,212 170,101
Total depreciation and amortization 71,922 72,314 65,528
Total assets 2,186,565 2,687,227  
Expenditures for tangible long-lived assets, excluding acquisitions 34,615 20,896 27,014
Operating Segments [Member] | Non-Medical Segment [Member]      
Segment Reporting Information [Line Items]      
Operating income as reported 14,697 11,335 1,513
Total depreciation and amortization 1,364 2,675 2,346
Total assets 53,812 54,071  
Expenditures for tangible long-lived assets, excluding acquisitions 573 661 1,451
Unallocated Amount to Segment [Member]      
Segment Reporting Information [Line Items]      
Operating income as reported (84,035) (82,898) (78,691)
Total depreciation and amortization 8,252 6,194 4,994
Total assets 86,304 107,047  
Expenditures for tangible long-lived assets, excluding acquisitions $ 6,110 $ 8,783 $ 8,251