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Statements of Consolidated Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Operating revenues $ 449,960 $ 472,695
Operating expenses:    
Purchased gas costs 84,066 115,238
Operation and maintenance 34,390 25,055
Production 27,023 16,111
Exploration 1,828 1,375
Selling, general and administrative 42,942 38,891
Depreciation, depletion and amortization 107,525 78,398
Total operating expenses 297,774 275,068
Gain on dispositions 1,110 22,785
Operating income 153,296 220,412
Equity in earnings of nonconsolidated investments 2,212 2,358
Other income 2,469 4,446
Interest expense 41,252 32,852
Income before income taxes 116,725 194,364
Income taxes 44,690 72,109
Net income $ 72,035 $ 122,255
Basic:    
Weighted average common shares outstanding (in shares) 149,494 149,271
Net income (in dollars per share) $ 0.48 $ 0.82
Diluted:    
Weighted average common shares outstanding (in shares) 150,216 150,002
Net income (in dollars per share) $ 0.48 $ 0.82
Dividends declared per common share (in dollars per share) $ 0.22 $ 0.22