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Other Income (Expense), Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Unrealized gain (loss) on investments under fair value method |  |  |  |  |  | $ 33,800 |  | $ 1,600 |  | $ (20,500) |
Other Nonoperating Income (Expense) |  |  |  |  |  | 51,713 |  | 2,381 |  | (20,113) |
Other income (expense), net |  |  |  |  |  | 796 |  | (89) |  | 387 |
kaleo [Member] |  |  |  |  |  |  |  |  |  |  |
Unrealized Gain (Loss) on Investments - kaleo |  |  |  |  |  | 33,800 |  | 1,600 |  | (20,500) |
Unrealized gain (loss) on investments under fair value method |  |  |  | $ 1,600 |  | 33,800 | [1] | 1,600 | [1] | (20,500) | [1]
Flexible Packaging Films [Member] |  |  |  |  |  |  |  |  |  |  |
Businesss Combination Settlement of Escrow Account |  | $ 11,900 |  |  |  | 11,900 |  | 0 |  | 0 |
Aluminum Extrusions [Member] |  |  |  |  |  |  |  |  |  |  |
Cast House Explosion pretax income/loss | $ 5,100 | $ 900 | $ 400 | 700 | $ (1,700) | 5,300 |  | 1,900 |  | 0 |
Alleghany and Bath County, Virginia [Member] |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments under fair value method |  |  |  | $ 1,000 |  | $ 0 |  | $ (1,032) |  | $ 0 |
[1] | See Notes 1, 3, 4 and 17 for more information on losses associated with plant shutdowns, asset impairments and restructurings, unusual items, gains or losses from sale of assets, gains or losses on an investment accounted for under the fair value method and other items.

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