Derivatives (Details 1)	Mar. 31, 2014 lb	Dec. 31, 2013 lb
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	27,200,000	22,900,000
Copper [Member]
Outstanding commodity futures contracts not designated as cash flow hedges
Notional amounts	2,900,000	2,000,000
Aluminum [Member]
Outstanding commodity futures contracts not designated as cash flow hedges
Notional amounts	2,700,000	2,700,000