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Consolidated Statements Of Changes In Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Amortization of pension and other post-retirement prior service cost, tax | $ 161 | $ 7 | $ 111
Changes in market value of derivative financial instruments, tax | $ 3,661 | $ 2,884 | $ 229
Exercise of options, shares tendered for payment | 45,123 | 182,270 | 27,177

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