Intangible Assets and Goodwill (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of cost, accumulated amortization and net book value of intangible assets

The cost and accumulated amortization of intangible assets subject to amortization as of December 31, 2019 and 2018, is as follows:

	2019							2018
(Thousands)	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Customer relationships	$	39,601	$	(37,692	)	$	1,909	$	39,601	$	(37,077	)	$	2,524
Technology	13,377		(12,816		)	561		13,377		(12,238		)	1,139
Licenses and other	4,257		(3,046		)	1,211		4,257		(2,725		)	1,532
Total	$	57,235	$	(53,554	)	$	3,681	$	57,235	$	(52,040	)	$	5,195

Finite-lived Intangible Assets Amortization Expense

The aggregate amortization expense relating to intangible assets for the year ended December 31, 2019 and estimated amortization expense for each of the five succeeding years is as follows:

	Amortization
(Thousands)	Expense
2019	$	1,400
2020	615
2021	523
2022	523
2023	513
2024	421

Schedule of Goodwill

The balance of goodwill at December 31, 2019 and 2018 was $79.0 million and $90.7 million, respectively.

A summary of changes in goodwill by reportable segment is as follows:

(Thousands)	Performance Alloys and Composites		Advanced Materials			Precision Coatings			Total
Balance at December 31, 2018	$	1,899	$	50,276		$	38,482		$	90,657
Impairment charge	—		—			(11,560		)	(11,560		)
Other	—		(86		)	—			(86		)
Balance at December 31, 2019	$	1,899	50,190			$	26,922		$	79,011