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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating revenues:      
Electric, natural gas distribution and pipeline and energy services $ 1,131,626 $ 1,343,714 $ 1,359,028
Exploration and production, construction materials and contracting, construction services and other 2,943,805 2,706,778 2,550,667
Total operating revenues 4,075,431 4,050,492 3,909,695
Operating expenses:      
Fuel and purchased power 72,380 64,485 63,065
Purchased natural gas sold 425,220 572,187 567,806
Operation and maintenance:      
Electric, natural gas distribution and pipeline and energy services 254,194 275,866 291,524
Exploration and production, construction materials and contracting, construction services and other 2,377,285 2,215,269 2,084,377
Depreciation, depletion and amortization 359,205 343,395 328,843
Taxes, other than income 176,140 172,923 163,353
Write-downs of oil and natural gas properties (Note 1) 391,800 0 0
Total operating expenses 4,056,224 3,644,125 3,498,968
Operating income 19,207 406,367 410,727
Earnings from equity method investments 5,383 4,693 30,816
Other income 6,642 6,520 8,018
Interest expense 76,699 81,354 83,011
Income (loss) before income taxes (45,467) 336,226 366,550
Income taxes (31,146) 110,274 122,530
Income (loss) from continuing operations (14,321) 225,952 244,020
Income (loss) from discontinued operations, net of tax (Note 3) 13,567 [1] (12,926) [1] (3,361) [1]
Net income (loss) (754) 213,026 240,659
Dividends declared on preferred stocks 685 685 685
Earnings (loss) on common stock $ (1,439) $ 212,341 $ 239,974
Earnings (loss) per common share - basic:      
Earnings (loss) before discontinued operations $ (0.08) $ 1.19 $ 1.29
Discontinued operations, net of tax $ 0.07 $ (0.07) $ (0.01)
Earnings (loss) per common share - basic $ (0.01) $ 1.12 $ 1.28
Earnings (loss) per common share - diluted:      
Earnings (loss) before discontinued operations $ (0.08) $ 1.19 $ 1.29
Discontinued operations, net of tax $ 0.07 $ (0.07) $ (0.02)
Earnings (loss) per common share - diluted $ (0.01) $ 1.12 $ 1.27
Dividends declared per common share $ 0.6750 $ 0.6550 $ 0.6350
Weighted average common shares outstanding - basic 188,826 188,763 188,137
Weighted average common shares outstanding - diluted 188,826 188,905 188,229
[1] Reflected in the Other category.