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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Operating revenues:        
Electric, natural gas distribution and pipeline and energy services $ 184,863 $ 212,848 $ 784,399 $ 964,866
Exploration and production, construction materials and contracting, construction services and other 988,655 939,333 2,209,889 2,019,877
Total operating revenues 1,173,518 1,152,181 2,994,288 2,984,743
Operating expenses:        
Fuel and purchased power 17,634 17,357 51,247 48,784
Purchased natural gas sold 35,199 50,102 279,038 396,326
Operation and maintenance:        
Electric, natural gas distribution and pipeline and energy services 67,830 69,475 188,945 207,465
Exploration and production, construction materials and contracting, construction services and other 793,850 767,519 1,793,347 1,663,927
Depreciation, depletion and amortization 91,850 88,897 260,858 256,861
Taxes, other than income 41,090 39,410 132,017 131,591
Write-down of oil and natural gas properties 160,100 0 160,100 0
Total operating expenses 1,207,553 1,032,760 2,865,552 2,704,954
Operating income (loss) (34,035) 119,421 128,736 279,789
Earnings from equity method investments 2,388 826 4,025 2,260
Other income 1,702 1,282 4,050 5,090
Interest expense 19,840 19,589 56,929 61,642
Income (loss) before income taxes (49,785) 101,940 79,882 225,497
Income taxes (20,253) 37,840 24,516 73,632
Income (loss) from continuing operations (29,532) 64,100 55,366 151,865
Income (loss) from discontinued operations, net of tax (139) (126) 4,867 154
Net income (loss) (29,671) 63,974 60,233 152,019
Dividends declared on preferred stocks 171 171 514 514
Earnings (loss) on common stock $ (29,842) $ 63,803 $ 59,719 $ 151,505
Earnings (loss) per common share - basic:        
Earnings (loss) before discontinued operations $ (0.16) $ 0.34 $ 0.29 $ 0.80
Discontinued operations, net of tax $ 0.00 $ 0.00 $ 0.03 $ 0.00
Earnings (loss) per share, basic $ (0.16) $ 0.34 $ 0.32 $ 0.80
Earnings (loss) per common share - diluted:        
Earnings (loss) before discontinued operations $ (0.16) $ 0.34 $ 0.29 $ 0.80
Discontinued operations, net of tax $ 0.00 $ 0.00 $ 0.03 $ 0.00
Earnings per common share - diluted $ (0.16) $ 0.34 $ 0.32 $ 0.80
Dividends declared per common share (in dollars per share) $ 0.1675 $ 0.1625 $ 0.5025 $ 0.4875
Weighted average common shares outstanding - basic 188,831 188,794 188,824 188,753
Weighted average common shares outstanding - diluted 188,831 188,797 189,029 188,760