Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill activity for each period was as follows:



(In thousands)	Specialty Chemicals and Engineered Materials		Micro-contamination Control		Advanced Materials Handling		Total
December 31, 2017	$	304,270	8,007		$	47,411	$	359,688
Addition due to acquisition	—		—		15,353		15,353
Foreign currency translation	299		—		—		299
March 31, 2018	$	304,569	$	8,007	$	62,764	$	375,340

Schedule of Acquired Finite-Lived Intangible Assets by Major Class

Identifiable intangible assets at March 31, 2018 and December 31, 2017 consist of the following:



March 31, 2018
(In thousands)	Gross carrying Amount		Accumulated amortization		Net carrying value
Developed technology	$	223,237	$	155,782	$	67,455
Trademarks and trade names	18,816		13,947		4,869
Customer relationships	221,993		115,051		106,942
Other	20,033		8,485		11,548
	$	484,079	$	293,265	$	190,814



December 31, 2017
(In thousands)	Gross carrying amount		Accumulated amortization		Net carrying value
Developed technology	$	206,224	$	149,215	$	57,009
Trademarks and trade names	16,807		13,712		3,095
Customer relationships	220,806		110,281		110,525
Other	20,032		8,231		11,801
	$	463,869	$	281,439	$	182,430

Estimated Future Amortization Expense

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 March 31, 2018 to be the following:




Fiscal year ending December 31	(In thousands)
2018	$	35,712
2019	44,760
2020	30,251
2021	23,589
2022	23,444
Thereafter	33,058
	$	190,814