Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill activity for each of the Company's reportable segments that carry goodwill, Specialty Chemicals and Engineered Materials (SCEM), Microcontamination Control (MC) and Advanced Materials Handling (AMH), for the years ended December 31, 2017 and 2016 is shown below:



(In thousands)	SCEM			MC		AMH		Total
December 31, 2015	$	294,700		$	—	$	47,411	$	342,111
Addition due to purchase accounting adjustments	4,434			—		—		4,434
Other, including foreign currency translation	(1,276		)	—		—		(1,276		)
December 31, 2016	297,858			—		47,411		345,269
Addition due to acquisition	—			8,007		—		8,007
Other, including foreign currency translation	6,412			—		—		6,412
December 31, 2017	$	304,270		$	8,007	$	47,411	$	359,688

Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block]

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



2017
(In thousands)	Gross carrying Amount		Accumulated amortization		Net carrying value		Weighted average life in years
Developed technology	206,224		149,215		57,009		6.6
Trademarks and trade names	16,807		13,712		3,095		9.9
Customer relationships	220,806		110,281		110,525		10.3
Other	20,032		8,231		11,801		6.7
	$	463,869	$	281,439	$	182,430	8.5



2016
(In thousands)	Gross carrying amount		Accumulated amortization		Net carrying value		Weighted average life in years
Developed technology	202,591		126,077		76,514		6.7
Trademarks and trade names	16,661		12,617		4,044		9.9
Customer relationships	216,918		90,581		126,337		10.3
Other	18,585		7,932		10,653		6.5
	$	454,755	$	237,207	$	217,548	8.5

Schedule Of Amortization Of Intangibles Table [Text Block]

The table below sets forth the amortization expense for the years ended December 31, 2017, 2016, and 2015:



(In thousands)	2017		2016		2015
Amortization expense	$	44,023	$	44,263	$	47,349

The following table presents amortization of intangibles for each of the Company’s segments for the years ended December 31, 2017, 2016 and 2015:



(In thousands)	2017		2016		2015
Amortization of intangibles:
SCEM	$	38,836	$	40,034	$	42,909
MC	881		—		—
AMH	4,306		4,229		4,440
Total amortization of intangibles	$	44,023	$	44,263	$	47,349

Estimated Future Amortization Expense

The 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 to be the following at December 31, 2017:



Fiscal year ending December 31	(In thousands)
2018	$	43,670
2019	41,540
2020	26,767
2021	20,055
2022	19,907
Thereafter	30,491
	$	182,430