GOODWILL AND INTANGIBLE ASSETS

Goodwill activity for each period was as follows:



(In thousands)	Specialty Chemicals and Engineered Materials		Microcontamination Control		Advanced Materials Handling		Total
December 31, 2016	$	297,858	$	—	$	47,411	$	345,269
Addition due to acquisition	—		8,007		—		8,007
Foreign currency translation	2,579		—		—		2,579
September 30, 2017	$	300,437	$	8,007	$	47,411	$	355,855

Identifiable intangible assets at September 30, 2017 and December 31, 2016 consist of the following:



September 30, 2017
(In thousands)	Gross carrying Amount		Accumulated amortization		Net carrying value
Developed technology	$	210,352	$	147,349	$	63,003
Trademarks and trade names	16,676		13,483		3,193
Customer relationships	219,080		105,581		113,499
Other	19,433		8,374		11,059
	$	465,541	$	274,787	$	190,754



December 31, 2016
(In thousands)	Gross carrying amount		Accumulated amortization		Net carrying value
Developed technology	$	202,591	$	126,077	$	76,514
Trademarks and trade names	16,661		12,617		4,044
Customer relationships	216,918		90,581		126,337
Other	18,585		7,932		10,653
	$	454,755	$	237,207	$	217,548

Future amortization expense for each of the five succeeding years and thereafter relating to intangible assets currently recorded in the Company's consolidated balance sheets is estimated at September 30, 2017 to be the following:




Fiscal year ending December 31	(In thousands)
2017	$	10,996
2018	43,659
2019	41,381
2020	26,718
2021	20,086
Thereafter	47,914
	$	190,754