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Derivative Financial Instruments (Narrative) (Details)
R$ in Thousands, $ in Thousands, lb in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2019
BRL (R$)
lb
Sep. 30, 2020
USD ($)
Dec. 31, 2018
USD ($)
lb
Sep. 30, 2019
USD ($)
Derivative [Line Items]        
Amounts of unrealized after tax gains (losses) to be Reclassified within Twelve Months   $ (1,000)    
Aluminum Futures Contracts        
Derivative [Line Items]        
Derivative, Notional Amount     $ 25,400 $ 20,200
Weight of aluminum that hedged future purchase of aluminum to meet fixed - price forward sales contract obligations, lbs | lb 19.1   22.5  
Net asset (liability), Fair Value     $ (1,630) (1,478)
Terphane Ltda [Member]        
Derivative [Line Items]        
Derivative, Notional Amount R$ 85,792     22,200
Accrued Expenses [Member] | Derivatives Designated As Hedging Instruments [Member] | Aluminum Futures Contracts        
Derivative [Line Items]        
Derivative Asset, Fair Value, Gross Asset     20 0
Derivative Liability, Fair Value, Gross Liability     $ 1,650 1,478
Cash Flow Hedging [Member] | Foreign Currency Forwwards And Options [Member]        
Derivative [Line Items]        
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax       $ 1,900
Oct-2018 [Member] | Terphane Ltda [Member]        
Derivative [Line Items]        
Annual Net Costs Mismatch Translation Exposure - Real vs US Dollar | R$ R$ 130,000