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Statements of Common Shareholders' Equity and Comprehensive Income (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Pension and postretirement medical liability adjustment, tax $ 155,000 $ 75,000 $ 1,088,000
Reclassification of net gains in hedging instruments from OCI to net income, tax $ 458,000 $ 0 $ 0