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Consolidated Statements of Income (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Operating revenues: |  |  |  |  |  |
Electric, natural gas distribution and pipeline and energy services | $ 1,343,714,000 |  | $ 1,359,028,000 |  | $ 1,504,269,000 |
Exploration and production, construction materials and contracting, construction services, and other | 2,706,778,000 |  | 2,550,667,000 |  | 2,672,232,000 |
Total operating revenues | 4,050,492,000 |  | 3,909,695,000 |  | 4,176,501,000 |
Operating expenses: |  |  |  |  |  |
Fuel and purchased power | 64,485,000 |  | 63,065,000 |  | 65,717,000 |
Purchased natural gas sold | 572,187,000 |  | 567,806,000 |  | 739,678,000 |
Operation and maintenance: |  |  |  |  |  |
Electric, natural gas distribution and pipeline and energy services | 275,866,000 |  | 291,524,000 |  | 263,869,000 |
Exploration and production, construction materials and contracting, construction services, and other | 2,215,269,000 |  | 2,084,377,000 |  | 2,143,195,000 |
Depreciation, depletion and amortization | 343,395,000 |  | 328,843,000 |  | 330,542,000 |
Taxes, other than income | 172,923,000 |  | 163,353,000 |  | 166,597,000 |
Noncash write-down of natural gas and oil properties | 0 |  | 0 |  | 620,000,000 |
Total operating expenses | 3,644,125,000 |  | 3,498,968,000 |  | 4,329,598,000 |
Operating income (loss) | 406,367,000 |  | 410,727,000 |  | (153,097,000) |
Earnings from equity method investments | 4,693,000 |  | 30,816,000 |  | 8,499,000 |
Other income | 6,520,000 |  | 8,018,000 |  | 9,331,000 |
Interest expense | 81,354,000 |  | 83,011,000 |  | 84,099,000 |
Income (loss) before income taxes | 336,226,000 |  | 366,550,000 |  | (219,366,000) |
Income taxes | 110,274,000 |  | 122,530,000 |  | (96,092,000) |
Income (loss) from continuing operations | 225,952,000 |  | 244,020,000 |  | (123,274,000) |
Income (loss) from discontinued operations, net of tax | (12,926,000) | [1] | (3,361,000) | [1] | 0 | [1]
Net income (loss) | 213,026,000 |  | 240,659,000 |  | (123,274,000) |
Dividends on preferred stocks | 685,000 |  | 685,000 |  | 685,000 |
Earnings (loss) on common stock | $ 212,341,000 |  | $ 239,974,000 |  | $ (123,959,000) |
Earnings (loss) per common share - basic: |  |  |  |  |  |
Earnings (Loss) Before Discontinued Operations | $ 1.19 |  | $ 1.29 |  | $ (0.67) |
Discontinued Operations, Net of Tax | $ (0.07) |  | $ (0.01) |  | $ 0.00 |
Earnings (Loss) Per Common Share - Basic | $ 1.12 |  | $ 1.28 |  | $ (0.67) |
Earnings (loss) per common share - diluted: |  |  |  |  |  |
Earnings (Loss) Before Discontinued Operations | $ 1.19 |  | $ 1.29 |  | $ (0.67) |
Discontinued Operations, Net of Tax | $ (0.07) |  | $ (0.02) |  | $ 0.00 |
Earnings (Loss) Per Common Share - Diluted | $ 1.12 |  | $ 1.27 |  | $ (0.67) |
Dividends per common share (in dollars per share) | $ 0.6550 |  | $ 0.6350 |  | $ 0.6225 |
Weighted average common shares outstanding - basic | 188,763 |  | 188,137 |  | 185,175 | [2]
Weighted Average Common Shares Outstanding - Diluted | 188,905 |  | 188,229 |  | 185,175 | [2]
[1] | Reflected in the Other category.
[2] | Due to the loss on common stock, 825 outstanding stock options, 18 restricted stock grants and 656 performance share awards were excluded from the computation of diluted loss per common share as their effect was antidilutive.

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