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Restructuring and Impairment Activities (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense | $ 400,000 | $ 1,500,000 | $ 1,400,000 | $ 4,200,000 |
Restructuring Reserve [Roll Forward] |  |  |  |  |
Balance at beginning of year |  |  | 1,700,000 | 4,300,000 | $ 4,300,000
Accruals for announced programs |  |  | 1,100,000 |  | 3,500,000
Cash payments |  |  | (2,500,000) |  | (6,400,000)
Other |  |  | 1,800,000 |  | 0
Exchange rate impacts |  |  | 0 |  | 300,000
Balance at end of period | 2,100,000 |  | 2,100,000 |  | $ 1,700,000
Corporate, Non-Segment [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense | 0 | (100,000) | 0 | 100,000 |
Engineered Papers [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense | 0 | 400,000 | 200,000 | 1,700,000 |
Engineered Papers [Member] | France [Member] | Employee severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense |  |  | 200,000 |  |
Engineered Papers [Member] | France, Brazil, And United States [Member] | Employee severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense |  |  |  | 900,000 |
Engineered Papers [Member] | Philippines [Member] | Asset Impairment Charge [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense |  |  | 0 | 800,000 |
Advanced Materials & Structures Segment [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense | $ 400,000 | $ 1,200,000 | 1,200,000 | $ 2,400,000 |
Advanced Materials & Structures Segment [Member] | UNITED STATES | Employee severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense |  |  | 900,000 |  |
Advanced Materials & Structures Segment [Member] | UNITED STATES | Asset Impairment Charge [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and impairment expense |  |  | $ 300,000 |  |

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