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Segment Information Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | $ 223,780 |  | $ 209,330 | $ 665,790 |  | $ 622,530
Operating profit (loss) | 29,880 |  | 28,290 | 96,610 |  | 70,620
Operating Segments [Member] | Packaging [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | 95,250 |  | 89,560 | 278,540 |  | 259,260
Operating profit (loss) | 22,060 |  | 23,140 | 64,450 |  | 61,630
Operating Segments [Member] | Aerospace [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | 49,070 |  | 48,550 | 140,500 |  | 141,550
Operating profit (loss) | 8,290 |  | 7,810 | 20,680 |  | 19,860
Operating Segments [Member] | Specialty Products [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | 79,460 |  | 71,220 | 246,750 |  | 221,720
Operating profit (loss) | 7,720 |  | 5,000 | 26,610 |  | 11,770
Corporate, Non-Segment [Member] | Corporate, Non-Segment [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating profit (loss) | $ (8,190) |  | $ (7,660) | $ (15,130) | [1] | $ (22,640)
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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