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Statements of Consolidated Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net income $ 72,035 $ 122,255
Net change in cash flow hedges:    
Natural gas, net of tax of $38,492 and $7,789 (see Note C) 59,502 (12,706)
Interest rate, net of tax of $1,801 and $0 2,438 30
Unrealized loss on available-for-sale securities, net of tax of $1,061   (1,971)
Pension and other post-retirement benefits liability adjustment, net of tax benefit of $122 and $282 947 412
Other comprehensive income (loss) 62,887 (14,235)
Comprehensive income $ 134,922 $ 108,020