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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, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating revenues | $ 1,081,144,000 |  | $ 1,173,518,000 |  | $ 967,962,000 |  | $ 852,807,000 | $ 1,065,749,000 |  | $ 1,152,181,000 | $ 930,757,000 | $ 901,805,000 | $ 4,075,431,000 |  | $ 4,050,492,000 |  | $ 3,909,695,000 |
Operating expenses | 1,190,673,000 | [1] | 1,207,553,000 | [2] | 876,248,000 | [3] | 781,750,000 | 939,172,000 |  | 1,032,760,000 | 848,454,000 | 823,739,000 | 4,056,224,000 |  | 3,644,125,000 |  | 3,498,968,000 |
Operating income | (109,529,000) | [1] | (34,035,000) | [2] | 91,714,000 | [3] | 71,057,000 | 126,577,000 |  | 119,421,000 | 82,303,000 | 78,066,000 | 19,207,000 |  | 406,367,000 |  | 410,727,000 |
Income (loss) from continuing operations | (69,686,000) | [1] | (29,532,000) | [2] | 49,007,000 | [3] | 35,890,000 | 74,088,000 |  | 64,100,000 | 45,235,000 | 42,529,000 | (14,321,000) |  | 225,952,000 |  | 244,020,000 |
Income (loss) from discontinued operations, net of tax | 8,700,000 | [1] | (139,000) |  | 5,106,000 | [3] | (100,000) | (13,080,000) | [1] | (126,000) | (168,000) | 448,000 | 13,567,000 | [4] | (12,926,000) | [4] | (3,361,000) | [4]
Net income (loss) | (60,986,000) | [1] | (29,671,000) | [2] | 54,113,000 | [3] | 35,790,000 | 61,008,000 | [1] | 63,974,000 | 45,067,000 | 42,977,000 | (754,000) |  | 213,026,000 |  | 240,659,000 |
Earnings (loss) per common share - basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) before discontinued operations | $ (0.37) | [1] | $ (0.16) | [2] | $ 0.26 | [3] | $ 0.19 | $ 0.39 |  | $ 0.34 | $ 0.24 | $ 0.22 | $ (0.08) |  | $ 1.19 |  | $ 1.29 |
Discontinued operations, net of tax | $ 0.05 | [1] | $ 0.00 |  | $ 0.03 | [3] | $ 0.00 | $ (0.07) | [1] | $ 0.00 | $ 0.00 | $ 0.01 | $ 0.07 |  | $ (0.07) |  | $ (0.01) |
Earnings (loss) per common share - basic | $ (0.32) | [1] | $ (0.16) | [2] | $ 0.29 | [3] | $ 0.19 | $ 0.32 | [1] | $ 0.34 | $ 0.24 | $ 0.23 | $ (0.01) |  | $ 1.12 |  | $ 1.28 |
Earnings per common share - diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) before discontinued operations | $ (0.37) | [1] | $ (0.16) | [2] | $ 0.26 | [3] | $ 0.19 | $ 0.39 |  | $ 0.34 | $ 0.24 | $ 0.22 | $ (0.08) |  | $ 1.19 |  | $ 1.29 |
Discontinued operations, net of tax | $ 0.05 | [1] | $ 0.00 |  | $ 0.03 | [3] | $ 0.00 | $ (0.07) | [1] | $ 0.00 | $ 0.00 | $ 0.01 | $ 0.07 |  | $ (0.07) |  | $ (0.02) |
Earnings (loss) per common share - diluted | $ (0.32) | [1] | $ (0.16) | [2] | $ 0.29 | [3] | $ 0.19 | $ 0.32 | [1] | $ 0.34 | $ 0.24 | $ 0.23 | $ (0.01) |  | $ 1.12 |  | $ 1.27 |
Weighted average common shares outstanding - basic | 188,831 |  | 188,831 |  | 188,831 |  | 188,811 | 188,794 |  | 188,794 | 188,794 | 188,671 | 188,826 |  | 188,763 |  | 188,137 |
Weighted average common shares outstanding - diluted | 188,831 |  | 188,831 |  | 189,107 |  | 189,182 | 188,932 |  | 188,797 | 188,968 | 188,815 | 188,826 |  | 188,905 |  | 188,229 |
Reversal of an arbitration charge after tax |  |  |  |  | 15,000,000 |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |
Noncash write-downs of oil and natural gas properties, after tax | 145,900,000 |  | 100,900,000 |  |  |  |  |  |  |  |  |  | 246,800,000 |  |  |  |  |
Arbitration charge after tax | $ (13,000,000) |  |  |  |  |  |  | $ 13,000,000 |  |  |  |  |  |  | $ 13,000,000 |  |  |
[1] | 2012 reflects a $145.9 million after-tax noncash write-down of oil and natural gas properties and the reversal of an arbitration charge of $13.0 million (after tax) related to a guarantee of a construction contract, which was partially offset by the reversal of estimated insurance recoveries, as previously discussed. 2011 reflects an arbitration charge of $13.0 million (after tax) related to a guarantee of a construction contract. For more information, see Notes 1 and 19, respectively.
[2] | 2012 reflects a $100.9 million after-tax noncash write-down of oil and natural gas properties. For more information, see Note 1.
[3] | 2012 reflects a net benefit of $15.0 million (after tax) related to natural gas gathering operations litigation and a net benefit largely related to estimated insurance recoveries related to the guarantee of a construction contract. For more information, see Note 19.
[4] | Reflected in the Other category.

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