Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Changes in the carrying amount of goodwill for the years ended December 31, 2018 and 2017 are as follows (dollars in thousands):

						Specialty
	Packaging			Aerospace		Products		Total
Balance, December 31, 2016	$	162,090		$	146,430	$	6,560	$	315,080
Foreign currency translation and other	4,310			—		—		4,310
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

Schedule of Intangible Assets (excluding Goodwill) by Major Class

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 as of December 31, 2018 and 2017 are summarized below (dollars in thousands):

	As of December 31, 2018					As of December 31, 2017
Intangible Category by Useful Life	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Finite-lived intangible assets:
Customer relationships, 5 - 12 years	$	73,450	$	(48,410	)	$	73,910	$	(41,000	)
Customer relationships, 15 - 25 years	132,230		(58,790		)	132,230		(51,880		)
Total customer relationships	205,680		(107,200		)	206,140		(92,880		)
Technology and other, 1 - 15 years	57,020		(31,600		)	57,340		(29,120		)
Technology and other, 17 - 30 years	43,300		(35,600		)	43,300		(33,490		)
Total technology and other	100,320		(67,200		)	100,640		(62,610		)
Indefinite-lived intangible assets:
Trademark/Trade names	42,930		—			42,930		—
Total other intangible assets	$	348,930	$	(174,400	)	$	349,710	$	(155,490	)

Schedule of Finite-Lived Intangible Assets, Amortization Expense

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

	Year ended December 31,
	2018		2017		2016
Technology and other, included in cost of sales	$	4,900	$	5,340	$	5,680
Customer relationships, included in selling, general and administrative expenses	14,540		14,580		14,790
Total amortization expense	$	19,440	$	19,920	$	20,470

Schedule of Expected Amortization Expense [Table Text Block]

Estimated amortization expense for the next five fiscal years beginning after December 31, 2018 is as follows (dollars in thousands):

Year ended December 31,	Estimated Amortization Expense
2019		$	19,080
2020		$	18,140
2021		$	15,360
2022		$	11,810
2023		$	9,910