Goodwill and Other Intangible Assets

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the carrying amount of goodwill for the three months ended March 31, 2021 are summarized as follows (dollars in thousands):



	Packaging		Aerospace		Specialty Products		Total
Balance, December 31, 2020	$	234,560	$	62,850	$	6,560	$	303,970




Foreign currency translation and other	(3,360)		—		—		(3,360)
Balance, March 31, 2021	$	231,200	$	62,850	$	6,560	$	300,610

The Company amortizes its other intangible assets over periods ranging from one to 30 years. The gross carrying amounts and accumulated amortization of the Company's other intangibles are summarized below (dollars in thousands):


	As of March 31, 2021				As of December 31, 2020
Intangible Category by Useful Life	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Finite-lived intangible assets:
Customer relationships, 5 – 12 years	$	121,760	$	(62,380)	$	122,970	$	(59,470)
Customer relationships, 15 – 25 years	122,280		(63,870)		122,280		(62,450)
Total customer relationships	244,040		(126,250)		245,250		(121,920)
Technology and other, 1 – 15 years	57,100		(33,640)		57,180		(32,800)
Technology and other, 17 – 30 years	43,300		(39,570)		43,300		(39,450)
Total technology and other	100,400		(73,210)		100,480		(72,250)
Indefinite-lived intangible assets:
Trademark/Trade names	54,030		—		54,640		—
Total other intangible assets	$	398,470	$	(199,460)	$	400,370	$	(194,170)

Amortization expense related to intangible assets as included in the accompanying consolidated statement of operations is summarized as follows (dollars in thousands):


	Three months ended March 31,
		2021		2020
Technology and other, included in cost of sales		$	950	$	1,210
Customer relationships, included in selling, general and administrative expenses		4,440		3,640
Total amortization expense		$	5,390	$	4,850