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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.