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Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Operating revenues: |  |  |  |
Electric, natural gas distribution and pipeline and energy services | $ 204,455 | $ 274,538 | $ 599,533 | $ 752,018
Exploration and production, construction materials and contracting, construction services and other | 763,507 | 656,219 | 1,221,236 | 1,080,544
Total operating revenues | 967,962 | 930,757 | 1,820,769 | 1,832,562
Operating expenses: |  |  |  |
Fuel and purchased power | 15,193 | 14,474 | 33,613 | 31,428
Purchased natural gas sold | 58,411 | 101,538 | 243,839 | 346,224
Operation and maintenance: |  |  |  |
Electric, natural gas distribution and pipeline and energy services | 52,717 | 70,028 | 121,115 | 137,989
Exploration and production, construction materials and contracting, construction services and other | 623,347 | 536,608 | 999,497 | 896,408
Depreciation, depletion and amortization | 83,627 | 83,290 | 169,007 | 167,964
Taxes, other than income | 42,953 | 42,516 | 90,928 | 92,181
Total operating expenses | 876,248 | 848,454 | 1,657,999 | 1,672,194
Operating income (loss) | 91,714 | 82,303 | 162,770 | 160,368
Earnings from equity method investments | 385 | 949 | 1,637 | 1,433
Other income | 1,249 | 1,908 | 2,349 | 3,809
Interest expense | 17,650 | 20,036 | 37,089 | 42,053
Income (loss) before income taxes | 75,698 | 65,124 | 129,667 | 123,557
Income taxes | 26,691 | 19,889 | 44,769 | 35,793
Income (loss) from continuing operations | 49,007 | 45,235 | 84,898 | 87,764
Income (loss) from discontinued operations, net of tax | 5,106 | (168) | 5,006 | 280
Net income (loss) | 54,113 | 45,067 | 89,904 | 88,044
Dividends declared on preferred stocks | 171 | 171 | 343 | 342
Earnings (loss) on common stock | $ 53,942 | $ 44,896 | $ 89,561 | $ 87,702
Earnings (loss) per common share - basic: |  |  |  |
Earnings (loss) before discontinued operations | $ 0.26 | $ 0.24 | $ 0.45 | $ 0.46
Discontinued operations, net of tax | $ 0.03 | $ 0.00 | $ 0.02 | $ 0.00
Earnings (loss) per common share - basic | $ 0.29 | $ 0.24 | $ 0.47 | $ 0.46
Earnings (loss) per common share - diluted: |  |  |  |
Earnings (loss) before discontinued operations | $ 0.26 | $ 0.24 | $ 0.45 | $ 0.46
Discontinued operations, net of tax | $ 0.03 | $ 0.00 | $ 0.02 | $ 0.00
Earnings (loss) per common share - diluted | $ 0.29 | $ 0.24 | $ 0.47 | $ 0.46
Dividends declared per common share (in dollars per share) | $ 0.1675 | $ 0.1625 | $ 0.3350 | $ 0.3250
Weighted average common shares outstanding - basic | 188,831 | 188,794 | 188,821 | 188,732
Weighted average common shares outstanding - diluted | 189,107 | 188,968 | 189,096 | 188,903

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