Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Changes in the carrying amount of goodwill for the years ended December 31, 2019 and 2018 are as follows (dollars in thousands):

							Specialty
	Packaging			Aerospace			Products		Total
Balance, December 31, 2017	$	166,400		$	146,430		$	6,560	$	319,390
Foreign currency translation and other	(2,740		)	—			—		(2,740		)
Balance, December 31, 2018	$	163,660		$	146,430		$	6,560	$	316,650
Goodwill from acquisitions	18,400			—			—		18,400
Goodwill reassigned in segment realignment	—			(12,740		)	12,740		—
Foreign currency translation and other	(410		)	—			—		(410		)
Balance, December 31, 2019	$	181,650		$	133,690		$	19,300	$	334,640

Schedule of Intangible Assets (excluding Goodwill) by Major Class

The gross carrying amounts and accumulated amortization of the Company's other intangibles as of December 31, 2019 and 2018 are summarized below (dollars in thousands):

	As of December 31, 2019					As of December 31, 2018
Intangible Category by Useful Life	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Finite-lived intangible assets:
Customer relationships, 5 - 12 years	$	73,860	$	(49,910	)	$	66,370	$	(42,580	)
Customer relationships, 15 - 25 years	122,280		(56,010		)	122,280		(49,560		)
Total customer relationships	196,140		(105,920		)	188,650		(92,140		)
Technology and other, 1 - 15 years	52,430		(29,790		)	52,420		(27,010		)
Technology and other, 17 - 30 years	43,300		(37,620		)	43,300		(35,600		)
Total technology and other	95,730		(67,410		)	95,720		(62,610		)
Indefinite-lived intangible assets:
Trademark/Trade names	42,850		—			38,270		—
Total other intangible assets	$	334,720	$	(173,330	)	$	322,640	$	(154,750	)

Schedule of Finite-Lived Intangible Assets, Amortization Expense

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

	Year ended December 31,
	2019		2018		2017
Technology and other, included in cost of sales	$	4,780	$	4,890	$	5,140
Customer relationships, included in selling, general and administrative expenses	13,850		13,370		13,400
Total amortization expense	$	18,630	$	18,260	$	18,540

Schedule of Expected Amortization Expense [Table Text Block]

Estimated amortization expense for the next five fiscal years beginning after December 31, 2019 is as follows (dollars in thousands):

Year ended December 31,	Estimated Amortization Expense
2020		$	18,280
2021		$	16,310
2022		$	12,760
2023		$	10,860
2024		$	9,360