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Segment Information Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | $ 224,910 |  | $ 213,370 | $ 442,010 |  | $ 413,200
Operating profit (loss) | 31,520 |  | 26,420 | 66,730 |  | 42,330
Operating Segments [Member] | Packaging [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | 95,090 |  | 88,740 | 183,290 |  | 169,700
Operating profit (loss) | 22,810 |  | 21,590 | 42,390 |  | 38,490
Operating Segments [Member] | Aerospace [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | 45,620 |  | 47,580 | 91,430 |  | 93,000
Operating profit (loss) | 7,310 |  | 6,990 | 12,390 |  | 12,050
Operating Segments [Member] | Specialty Products [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | 84,200 |  | 77,050 | 167,290 |  | 150,500
Operating profit (loss) | 9,240 |  | 5,260 | 18,890 |  | 6,770
Corporate, Non-Segment [Member] | Corporate, Non-Segment [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating profit (loss) | $ (7,840) |  | $ (7,420) | $ (6,940) | [1] | $ (14,980)
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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