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Derivative Financial Instruments (Narrative) (Details)
$ in Thousands, lb in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
lb
Dec. 31, 2014
USD ($)
lb
Derivative [Line Items]    
Amounts of unrealized after tax gains (losses) to be Reclassified within Twelve Months $ (1,900)  
Aluminum Futures Contracts    
Derivative [Line Items]    
Notional Amount $ 20,500 $ 8,600
Weight of aluminum that hedged future purchase of aluminum to meet fixed - price forward sales contract obligations, lbs | lb 21.8 7.8
Net asset (liability), Fair Value $ (3,069) $ (236)
Accrued Expenses [Member] | Derivatives Not Designated As Hedging Instruments | Aluminum Futures Contracts    
Derivative [Line Items]    
Derivative Asset, Fair Value, Gross Asset   7
Derivative Liability, Fair Value, Gross Liability 0 7
Accrued Expenses [Member] | Derivatives Designated As Hedging Instruments [Member] | Aluminum Futures Contracts    
Derivative [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 82
Derivative Liability, Fair Value, Gross Liability $ 3,069 $ 318