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Rationalizations and Impairments (Narrative) (Details) metric_tons in Thousands, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 02, 2015 USD ($) employee | Sep. 30, 2015 USD ($) | Sep. 30, 2014 | Sep. 30, 2015 USD ($) employee metric_tons | Sep. 30, 2014 | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
2013 Rationalization Initiatives |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  | $ 300 |  |  |  |  |
Expected cash outlay |  |  |  | $ 1,057 |  |  | $ 16,494
Industrial Materials Segment |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Estimated reduction in capacity (metric tons) | metric_tons |  |  |  | 60 |  |  |
Expected number of positions eliminated (employees) | employee |  |  |  | 600 |  |  |
Number of positions eliminated (percent) |  |  |  |  | 20.00% |  |
Engineered Solutions Segment |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected number of positions eliminated (employees) | employee |  |  |  | 40 |  |  |
2014 Engineered Solutions Rationalization |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected cash outlay |  |  |  | $ 979 |  |  | 916
2014 Corporate and Research & Development Rationalization |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Number of positions eliminated (percent) |  |  | 25.00% |  |  |  |
Expected cost |  | 20,000 |  | 20,000 |  |  |
Restructuring and Related Cost, Cost Incurred to Date |  | 14,000 |  | 14,000 |  |  |
Expected cash outlay |  |  |  | 5,046 |  |  | $ 1,155
2014 Corporate and Research & Development Rationalization | Scenario, Forecast |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected cash outlay |  |  |  |  |  | $ 12,000 |
2015 Advanced Graphite Materials Rationalization |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected number of positions eliminated (employees) | employee | 85 |  |  |  |  |  |
Expected cost | $ 10,000 |  |  |  |  |  |
Expected cash outlay |  |  |  | 2,032 |  |  |
2015 Advanced Graphite Materials Rationalization | Scenario, Forecast |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected cash outlay |  |  |  |  |  | $ 8,000 |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | 2013 Rationalization Initiatives |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Property, plant and equipment |  | 7,700 |  | 7,700 |  |  |
Other Accrued Liabilities |  | $ 1,500 |  | $ 1,500 |  |  |

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