(6.) GOODWILL AND OTHER INTANGIBLE ASSETS, NET

Goodwill

The change in the carrying amount of goodwill by reportable segment during fiscal year 2018 was as follows (in thousands):



	Medical			Non-Medical		Total
December 29, 2017	$	822,870		$	17,000	$	839,870
Foreign currency translation	(7,532		)	—		(7,532		)
December 28, 2018	$	815,338		$	17,000	$	832,338

As of December 28, 2018, no accumulated impairment loss has been recognized for the goodwill allocated to the Company’s Medical or Non-Medical segments.

Intangible Assets

Intangible assets are comprised of the following (in thousands):



	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
December 28, 2018
Definite-lived:
Purchased technology and patents	$	241,726	$	(125,540	)	$	116,186
Customer lists	710,406		(104,556		)	605,850
Other	3,503		(3,489		)	14
Total amortizing intangible assets	$	955,635	$	(233,585	)	$	722,050
Indefinite-lived:
Trademarks and tradenames						$	90,288

December 29, 2017
Definite-lived:
Purchased technology and patents	$	243,679	$	(111,185	)	$	132,494
Customer lists	718,649		(78,621		)	640,028
Other	4,660		(4,597		)	63
Total amortizing intangible assets	$	966,988	$	(194,403	)	$	772,585
Indefinite-lived:
Trademarks and tradenames						$	90,288

Aggregate intangible asset amortization expense is comprised of the following for fiscal years 2018, 2017 and 2016 (in thousands):



	2018		2017		2016
Cost of sales	$	14,134	$	15,183	$	15,368
SG&A	26,658		24,840		19,590
RD&E	154		545		512
Other Operating Expenses (“OOE”)	514		2,538		—
Total intangible asset amortization expense	$	41,460	$	43,106	$	35,470

Estimated future intangible asset amortization expense based upon the carrying value as of December 28, 2018 is as follows (in thousands):



	2019		2020		2021		2022		2023		After 2023
Amortization Expense	$	40,200	$	40,511	$	39,658	$	38,623	$	36,779	$	526,279