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Segment Information Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Net sales | $ 182,790 | $ 173,370
Operating profit (loss) | 19,830 | 19,800
Operating Segments [Member] | Packaging [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 100,050 | 88,840
Operating profit (loss) | 18,280 | 17,640
Operating Segments [Member] | Aerospace [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 48,920 | 45,580
Operating profit (loss) | 5,080 | 5,810
Operating Segments [Member] | Specialty Products [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 33,820 | 38,950
Operating profit (loss) | 3,430 | 4,700
Corporate, Non-Segment [Member] | Corporate, Non-Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating profit (loss) | $ (6,960) | $ (8,350)

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