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Segment Information Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018		Mar. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 217,100		$ 199,830
Operating profit (loss)	35,210		15,910
Operating Segments [Member] | Packaging [Member]
Segment Reporting Information [Line Items]
Net sales	88,200		80,960
Operating profit (loss)	19,580		16,900
Operating Segments [Member] | Aerospace [Member]
Segment Reporting Information [Line Items]
Net sales	45,810		45,420
Operating profit (loss)	5,080		5,060
Operating Segments [Member] | Specialty Products [Member]
Segment Reporting Information [Line Items]
Net sales	83,090		73,450
Operating profit (loss)	9,650		1,510
Corporate, Non-Segment [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	900	[1]	$ (7,560)
Selling, General and Administrative Expenses [Member]
Segment Reporting Information, Additional Information [Abstract]
Loss Contingency Accrual, Period Increase (Decrease)	$ (8,200)
[1] During the first quarter of 2018, the Company removed an obligation from its balance sheet, resulting in an approximate $8.2 million non-cash reduction in selling, general and administrative expenses. See Note 10, "Commitments and Contingencies," for further details.

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Amount of increase (decrease) in loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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