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Other Income (Expense), Net (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Unrealized gain (loss) on investments under fair value method   $ 10,900 $ 30,600 $ 33,800
Other Nonoperating Income (Expense)   34,795 30,459 51,713
Other income (expense), net   (3) 45 796
kaleo [Member]        
Unrealized Gain (Loss) on Investments - kaleo   28,482 30,600 33,800
Unrealized gain (loss) on investments under fair value method [1]   28,482 30,600 33,800
Flexible Packaging Films [Member]        
Loss Contingency, Estimate of Possible Loss   1,000    
Businesss Combination Settlement of Escrow Account   0 0 11,900
Aluminum Extrusions [Member]        
Cast House Explosion pretax income/loss   0 0 5,300
Alleghany and Bath County, Virginia [Member]        
Gain (Loss) on Disposition of Assets   0 (38) 0
Unrealized gain (loss) on investments under fair value method   0 $ (186) $ 0
Other Restructuring [Member] | Film Products Manufacturing Facility In Shanghai, China [Member] | PE Films [Member]        
Gain (Loss) on Disposition of Assets $ 6,300 $ 6,316    
[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.