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Hedging Transactions and Derivative Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2012
Schedule of Notional Amounts of Outstanding Derivative Positions
Notional Value of Copper Derivatives
Copper
125 metric tons per month
Notional Values of Foreign Currency Derivatives
Euro
€735,000

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance