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Statements of Consolidated Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Statements of Consolidated Comprehensive Income    
Natural gas, tax (in dollars) $ 38,492 $ 7,789
Interest rate, tax (in dollars) 1,801 0
Unrealized loss on available-for-sale securities, tax (in dollars) 0 1,061
Pension and other post-retirement benefits liability adjustment, tax benefit (in dollars) $ 122 $ 282