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Segment Information Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | $ 236,830 | $ 223,780 |  | $ 697,490 | $ 665,790 |
Operating profit (loss) | 28,690 | 29,880 |  | 85,650 | 96,610 |
Operating Segments [Member] | Packaging [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | 105,480 | 95,250 |  | 298,310 | 278,540 |
Operating profit (loss) | 19,740 | 22,060 |  | 60,020 | 64,450 |
Operating Segments [Member] | Aerospace [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | 43,140 | 40,890 |  | 123,710 | 117,780 |
Operating profit (loss) | 8,230 | 7,680 |  | 20,980 | 18,720 |
Operating Segments [Member] | Specialty Products [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | 88,210 | 87,640 |  | 275,470 | 269,470 |
Operating profit (loss) | 8,400 | 8,330 |  | 29,430 | 28,570 |
Corporate, Non-Segment [Member] | Corporate, Non-Segment [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating profit (loss) | $ (7,680) | $ (8,190) |  | $ (24,780) | $ (15,130) | [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 12, "Commitments and Contingencies," for further details.

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