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Derivative Financial Instruments (Narrative) (Details)
R$ in Thousands, $ in Thousands, lb in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
lb
Dec. 31, 2018
USD ($)
lb
Mar. 31, 2019
BRL (R$)
Mar. 31, 2019
USD ($)
Derivative [Line Items]        
Amounts of unrealized after tax gains (losses) to be Reclassified within Twelve Months $ 1,200      
Aluminum Futures Contracts        
Derivative [Line Items]        
Notional Amount   $ 25,400   $ 24,600
Weight of aluminum that hedged future purchase of aluminum to meet fixed - price forward sales contract obligations, lbs | lb 22.2 22.5    
Net asset (liability), Fair Value   $ (1,630)   (1,259)
Terphane Ltda [Member]        
Derivative [Line Items]        
Notional Amount     R$ 129,682 33,675
Accrued Expenses [Member] | Derivatives Designated As Hedging Instruments [Member] | Aluminum Futures Contracts        
Derivative [Line Items]        
Derivative Asset, Fair Value, Gross Asset   20   25
Derivative Liability, Fair Value, Gross Liability   $ 1,650   1,284
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       $ 1,500
Oct-2018 [Member] | Terphane Ltda [Member]        
Derivative [Line Items]        
Annual Net Costs Mismatch Translation Exposure - Real vs US Dollar $ 125,000