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Business segment data (Details) (USD $) | 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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total external 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 |
Total intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 343,395,000 |  | 328,843,000 |  | 330,542,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 81,354,000 |  | 83,011,000 |  | 84,099,000 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 110,274,000 |  | 122,530,000 |  | (96,092,000) |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 225,267,000 |  | 243,335,000 |  | (123,959,000) |
Income (loss) from discontinued operations, net of tax | (13,080,000) | [1] | (126,000) | (168,000) | 448,000 | (3,361,000) |  | 0 | 0 | 0 | (12,926,000) | [2] | (3,361,000) | [2] | 0 | [2]
Earnings (loss) on common stock |  |  |  |  |  |  |  |  |  |  | 212,341,000 |  | 239,974,000 |  | (123,959,000) |
Net proceeds from sale or disposition of property and other |  |  |  |  |  |  |  |  |  |  | 40,857,000 |  | 78,761,000 |  | 26,679,000 |
Net capital expenditures |  |  |  |  |  |  |  |  |  |  | 481,023,000 |  | 495,246,000 |  | 428,012,000 |
Total assets | 6,556,125,000 |  |  |  |  | 6,303,549,000 |  |  |  |  | 6,556,125,000 |  | 6,303,549,000 |  | 5,990,952,000 |
Property, plant and equipment | 7,646,222,000 |  |  |  |  | 7,218,503,000 |  |  |  |  | 7,646,222,000 |  | 7,218,503,000 |  |  |
Less accumulated depreciation, depletion and amortization | 3,361,208,000 |  |  |  |  | 3,103,323,000 |  |  |  |  | 3,361,208,000 |  | 3,103,323,000 |  | 2,872,465,000 |
Net property, plant and equipment | 4,285,014,000 |  |  |  |  | 4,115,180,000 |  |  |  |  | 4,285,014,000 |  | 4,115,180,000 |  | 3,894,117,000 |
Additional information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncash write-down of natural gas and oil properties |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 620,000,000 |
Noncash write-down of natural gas and oil properties, after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 384,400,000 |
Natural gas gathering arbitration charge, after tax |  |  |  |  |  |  |  | 16,500,000 |  |  |  |  | 16,500,000 |  |  |
Net noncash transactions included in capital expenditures |  |  |  |  |  |  |  |  |  |  | 24,000,000 |  | 17,500,000 |  |  |
Regulated Operation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total external operating revenues |  |  |  |  |  |  |  |  |  |  | 1,343,714,000 |  | 1,359,028,000 |  | 1,504,269,000 |
Unregulated Operation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total external operating revenues |  |  |  |  |  |  |  |  |  |  | 2,706,778,000 |  | 2,550,667,000 |  | 2,672,232,000 |
Electric [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total external operating revenues |  |  |  |  |  |  |  |  |  |  | 225,468,000 |  | 211,544,000 |  | 196,171,000 |
Total intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 32,177,000 |  | 27,274,000 |  | 24,637,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 13,745,000 |  | 12,216,000 |  | 9,577,000 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 7,242,000 |  | 11,187,000 |  | 8,205,000 |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 29,258,000 |  | 28,908,000 |  | 24,099,000 |
Net capital expenditures |  |  |  |  |  |  |  |  |  |  | 52,072,000 |  | 85,787,000 |  | 115,240,000 |
Total assets | 672,940,000 | [3] |  |  |  | 643,636,000 | [3] |  |  |  | 672,940,000 | [3] | 643,636,000 | [3] | 569,666,000 | [3]
Property, plant and equipment | 1,068,524,000 | [3] |  |  |  | 1,027,034,000 | [3] |  |  |  | 1,068,524,000 | [3] | 1,027,034,000 | [3] | 941,791,000 | [3]
Natural gas distribution [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total external operating revenues |  |  |  |  |  |  |  |  |  |  | 907,400,000 |  | 892,708,000 |  | 1,072,776,000 |
Total intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 44,641,000 |  | 43,044,000 |  | 42,723,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 29,444,000 |  | 28,996,000 |  | 30,656,000 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 16,931,000 |  | 12,171,000 |  | 16,331,000 |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 38,398,000 |  | 36,944,000 |  | 30,796,000 |
Net capital expenditures |  |  |  |  |  |  |  |  |  |  | 70,624,000 |  | 75,365,000 |  | 43,820,000 |
Total assets | 1,679,091,000 | [3] |  |  |  | 1,632,012,000 | [3] |  |  |  | 1,679,091,000 | [3] | 1,632,012,000 | [3] | 1,588,144,000 | [3]
Property, plant and equipment | 1,568,866,000 | [3] |  |  |  | 1,508,845,000 | [3] |  |  |  | 1,568,866,000 | [3] | 1,508,845,000 | [3] | 1,456,208,000 | [3]
Pipeline and energy services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total external operating revenues |  |  |  |  |  |  |  |  |  |  | 210,846,000 |  | 254,776,000 |  | 235,322,000 |
Total intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 67,497,000 |  | 75,033,000 |  | 72,505,000 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 25,502,000 |  | 26,001,000 |  | 25,581,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 10,516,000 |  | 9,064,000 |  | 8,896,000 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 12,912,000 |  | 13,933,000 |  | 22,982,000 |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 23,082,000 |  | 23,208,000 |  | 37,845,000 |
Net capital expenditures |  |  |  |  |  |  |  |  |  |  | 45,556,000 |  | 14,255,000 |  | 70,168,000 |
Total assets | 526,797,000 |  |  |  |  | 523,075,000 |  |  |  |  | 526,797,000 |  | 523,075,000 |  | 538,230,000 |
Property, plant and equipment | 719,291,000 |  |  |  |  | 683,807,000 |  |  |  |  | 719,291,000 |  | 683,807,000 |  | 675,199,000 |
Exploration and production [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total external operating revenues |  |  |  |  |  |  |  |  |  |  | 359,873,000 |  | 318,570,000 |  | 338,425,000 |
Total intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 93,713,000 |  | 115,784,000 |  | 101,230,000 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 142,645,000 |  | 130,455,000 |  | 129,922,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 7,445,000 |  | 8,580,000 |  | 10,621,000 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 46,298,000 |  | 49,034,000 |  | (187,000,000) |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 80,282,000 |  | 85,638,000 |  | (296,730,000) |
Net capital expenditures |  |  |  |  |  |  |  |  |  |  | 272,855,000 |  | 355,845,000 |  | 183,140,000 |
Total assets | 1,481,556,000 |  |  |  |  | 1,342,808,000 |  |  |  |  | 1,481,556,000 |  | 1,342,808,000 |  | 1,137,628,000 |
Property, plant and equipment | 2,615,146,000 |  |  |  |  | 2,356,938,000 |  |  |  |  | 2,615,146,000 |  | 2,356,938,000 |  | 2,028,794,000 |
Construction materials and contracting [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total external operating revenues |  |  |  |  |  |  |  |  |  |  | 1,509,538,000 |  | 1,445,148,000 |  | 1,515,122,000 |
Total intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 472,000 |  | 0 |  | 0 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 85,459,000 |  | 88,331,000 |  | 93,615,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 16,241,000 |  | 19,859,000 |  | 20,495,000 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 11,227,000 |  | 13,822,000 |  | 25,940,000 |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 26,430,000 |  | 29,609,000 |  | 47,085,000 |
Net capital expenditures |  |  |  |  |  |  |  |  |  |  | 52,303,000 |  | 25,724,000 |  | 26,313,000 |
Total assets | 1,374,026,000 |  |  |  |  | 1,382,836,000 |  |  |  |  | 1,374,026,000 |  | 1,382,836,000 |  | 1,449,469,000 |
Property, plant and equipment | 1,499,852,000 |  |  |  |  | 1,486,375,000 |  |  |  |  | 1,499,852,000 |  | 1,486,375,000 |  | 1,514,989,000 |
Construction services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total external operating revenues |  |  |  |  |  |  |  |  |  |  | 834,918,000 |  | 786,802,000 |  | 818,685,000 |
Total intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 19,471,000 |  | 2,298,000 |  | 379,000 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 11,399,000 |  | 12,147,000 |  | 12,760,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 4,473,000 |  | 4,411,000 |  | 4,490,000 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 13,426,000 |  | 11,456,000 |  | 15,189,000 |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 21,627,000 |  | 17,982,000 |  | 25,589,000 |
Net capital expenditures |  |  |  |  |  |  |  |  |  |  | 9,711,000 |  | 14,849,000 |  | 12,814,000 |
Total assets | 418,519,000 |  |  |  |  | 387,627,000 |  |  |  |  | 418,519,000 |  | 387,627,000 |  | 328,895,000 |
Property, plant and equipment | 124,796,000 |  |  |  |  | 122,940,000 |  |  |  |  | 124,796,000 |  | 122,940,000 |  | 116,236,000 |
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total external operating revenues |  |  |  |  |  |  |  |  |  |  | 2,449,000 |  | 147,000 |  | 0 |
Total intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 8,997,000 |  | 7,580,000 |  | 9,487,000 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 1,572,000 |  | 1,591,000 |  | 1,304,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 0 |  | 47,000 |  | 43,000 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 2,238,000 |  | 10,927,000 |  | 2,261,000 |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 6,190,000 |  | 21,046,000 |  | 7,357,000 |
Net capital expenditures |  |  |  |  |  |  |  |  |  |  | 18,759,000 |  | 2,182,000 |  | 3,196,000 |
Total assets | 403,196,000 | [4] |  |  |  | 391,555,000 | [4] |  |  |  | 403,196,000 | [4] | 391,555,000 | [4] | 378,920,000 | [4]
Property, plant and equipment | 49,747,000 |  |  |  |  | 32,564,000 |  |  |  |  | 49,747,000 |  | 32,564,000 |  | 33,365,000 |
Intersegment Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | (190,150,000) |  | (200,695,000) |  | (183,601,000) |
Interest expense |  |  |  |  |  |  |  |  |  |  | $ (510,000) |  | $ (162,000) |  | $ (679,000) |
[1] | 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.
[2] | Reflected in the Other category.
[3] | Includes allocations of common utility property.
[4] | Includes assets not directly assignable to a business (i.e. cash and cash equivalents, certain accounts receivable, certain investments and other miscellaneous current and deferred assets).

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- Definition This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items before deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. Includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.14) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 15 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 + Details
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