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Derivative Financial Instruments (Details 1) - Designated as Hedging Instrument [Member]
Sep. 30, 2015
MMBTU
T
t
Dec. 31, 2014
MMBTU
T
t
Aluminum [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 1,510 1,657
Copper [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 583 820
Natural Gas [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | MMBTU 298,703 347,608
Steel [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | T 20,388 14,665