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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

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