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Derivative Financial Instruments (Narrative) (Details)
$ in Thousands, lb in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
lb
Dec. 31, 2013
lb
Dec. 31, 2014
USD ($)
Derivative [Line Items]      
Amounts of unrealized after tax gains (losses) to be Reclassified within Twelve Months $ (1,800)    
Aluminum Futures Contracts      
Derivative [Line Items]      
Notional Amount $ 23,300   $ 8,600
Weight of aluminum that hedged future purchase of aluminum to meet fixed - price forward sales contract obligations, lbs | lb 23.8 7.8  
Net asset (liability), Fair Value $ (2,836)   (236)
Accrued Expenses [Member] | Derivatives Not Designated As Hedging Instruments | Aluminum Futures Contracts      
Derivative [Line Items]      
Derivative Asset, Fair Value, Gross Asset 29   7
Derivative Liability, Fair Value, Gross Liability 29   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 $ 2,836   $ 318