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Segment Information Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 221,290 | $ 217,100 |
Operating profit (loss) | 25,850 | 35,210 |
Operating Segments [Member] | Packaging [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 88,840 | 88,200 |
Operating profit (loss) | 17,640 | 19,580 |
Operating Segments [Member] | Aerospace [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 38,330 | 37,790 |
Operating profit (loss) | 5,740 | 4,590 |
Operating Segments [Member] | Specialty Products [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 94,120 | 91,110 |
Operating profit (loss) | 10,860 | 10,140 |
Corporate, Non-Segment [Member] | Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating profit (loss) | $ (8,390) | 900 | [1]
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 11, "Commitments and Contingencies," for further details.

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