Derivatives (Details 1)	Dec. 31, 2013 lb	Dec. 31, 2012 lb
Derivative [Line Items]
Derivative, Notional Amount	22,900,000	22,800,000
Copper [Member]
Outstanding commodity futures contracts not designated as cash flow hedges
Notional amounts not designated as cash flow hedges	2,000,000	2,100,000
Aluminum [Member]
Outstanding commodity futures contracts not designated as cash flow hedges
Notional amounts not designated as cash flow hedges	2,700,000	2,800,000