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Supplemental Financial Information (Unaudited) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Operating revenues | $ 1,065,749,000 |  | $ 1,152,181,000 | $ 930,757,000 | $ 901,805,000 | $ 1,042,551,000 |  | $ 1,125,923,000 |  | $ 906,444,000 | $ 834,777,000 | $ 4,050,492,000 |  | $ 3,909,695,000 |  | $ 4,176,501,000 |
Operating expenses | 939,172,000 |  | 1,032,760,000 | 848,454,000 | 823,739,000 | 912,377,000 |  | 1,016,961,000 | [1] | 817,782,000 | 751,848,000 | 3,644,125,000 |  | 3,498,968,000 |  | 4,329,598,000 |
Operating income (loss) | 126,577,000 |  | 119,421,000 | 82,303,000 | 78,066,000 | 130,174,000 |  | 108,962,000 | [1] | 88,662,000 | 82,929,000 | 406,367,000 |  | 410,727,000 |  | (153,097,000) |
Income (loss) from continuing operations | 74,088,000 |  | 64,100,000 | 45,235,000 | 42,529,000 | 92,300,000 | [2] | 61,010,000 | [1] | 48,938,000 | 41,772,000 | 225,952,000 |  | 244,020,000 |  | (123,274,000) |
Income (loss) from discontinued operations, net of tax | (13,080,000) | [3] | (126,000) | (168,000) | 448,000 | (3,361,000) |  | 0 |  | 0 | 0 | (12,926,000) | [4] | (3,361,000) | [4] | 0 | [4]
Net income (loss) | 61,008,000 | [3] | 63,974,000 | 45,067,000 | 42,977,000 | 88,939,000 | [2] | 61,010,000 | [1] | 48,938,000 | 41,772,000 | 213,026,000 |  | 240,659,000 |  | (123,274,000) |
Earnings per common share - basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (Loss) Before Discontinued Operations | $ 0.39 |  | $ 0.34 | $ 0.24 | $ 0.22 | $ 0.49 | [2] | $ 0.32 | [1] | $ 0.26 | $ 0.22 | $ 1.19 |  | $ 1.29 |  | $ (0.67) |
Discontinued Operations, Net of Tax | $ (0.07) | [3] | $ 0 | $ 0 | $ 0.01 | $ (0.02) |  | $ 0 |  | $ 0 | $ 0 | $ (0.07) |  | $ (0.01) |  | $ 0.00 |
Earnings (Loss) Per Common Share - Basic | $ 0.32 | [3] | $ 0.34 | $ 0.24 | $ 0.23 | $ 0.47 | [2] | $ 0.32 | [1] | $ 0.26 | $ 0.22 | $ 1.12 |  | $ 1.28 |  | $ (0.67) |
Earnings per common share - diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (Loss) Before Discontinued Operations | $ 0.39 |  | $ 0.34 | $ 0.24 | $ 0.22 | $ 0.49 | [2] | $ 0.32 | [1] | $ 0.26 | $ 0.22 | $ 1.19 |  | $ 1.29 |  | $ (0.67) |
Discontinued Operations, Net of Tax | $ (0.07) | [3] | $ 0 | $ 0 | $ 0.01 | $ (0.02) |  | $ 0 |  | $ 0 | $ 0 | $ (0.07) |  | $ (0.02) |  | $ 0.00 |
Earnings (Loss) Per Common Share - Diluted | $ 0.32 | [3] | $ 0.34 | $ 0.24 | $ 0.23 | $ 0.47 | [2] | $ 0.32 | [1] | $ 0.26 | $ 0.22 | $ 1.12 |  | $ 1.27 |  | $ (0.67) |
Weighted average common shares outstanding - basic | 188,794 |  | 188,794 | 188,794 | 188,671 | 188,281 |  | 188,170 |  | 188,129 | 187,963 | 188,763 |  | 188,137 |  | 185,175 | [5]
Weighted Average Common Shares Outstanding - Diluted | 188,932 |  | 188,797 | 188,968 | 188,815 | 188,374 |  | 188,338 |  | 188,267 | 188,220 | 188,905 |  | 188,229 |  | 185,175 | [5]
Natural gas gathering arbitration charge, after tax |  |  |  |  |  |  |  | 16,500,000 |  |  |  |  |  | 16,500,000 |  |  |
Arbitration charge after tax | 13,000,000 |  |  |  |  |  |  |  |  |  |  | 13,000,000 |  |  |  |  |
Recognized gain on sale of ownership interests, after tax |  |  |  |  |  | $ 13,800,000 |  |  |  |  |  |  |  |  |  |  |
[1] | 2010 reflects a natural gas gathering arbitration charge of $16.5 million (after tax). For more information, see Note 19.
[2] | 2010 reflects a $13.8 million (after tax) gain on the sale of the Brazilian Transmission Lines. For more information, see Note 4.
[3] | 2011 reflects an arbitration charge of $13.0 million (after tax) related to a guarantee of a construction contract. For more information, see Note 19.
[4] | Reflected in the Other category.
[5] | 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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