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Business segment data (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Business segment data [Line Items] |  |  |
Revenues | $ 6,973,864 | $ 5,680,733 | $ 5,532,750
Depreciation, depletion and amortization | 327,826 | 299,214 | 285,100
Operating income (loss) | 573,953 | 534,219 | 544,925
Interest expense | 119,273 | 93,984 | 96,519
Income taxes | 94,783 | 88,920 | 84,590
Income from continuing operations | 367,276 | 377,731 | 390,527
Discontinued operations, net of tax | 213 | 400 | (322)
Net income | 367,489 | 378,131 | 390,205
Capital expenditures | 656,559 | 935,806 | 648,279
Total assets | 9,660,781 | 8,910,435 | 8,053,372
Property, Plant and Equipment, Gross | 9,364,038 | 8,972,849 |
Less accumulated depreciation, depletion and amortization | 3,272,493 | 3,216,461 | 3,133,831
Net property, plant and equipment | 6,091,545 | 5,756,388 | 5,166,939
Additional information [Abstract] |  |  |
Net noncash acquisitions, capital expenditure-related accounts payable and AFUDC | 1,700 | 38,700 | (15,700)
Electric |  |  |
Business segment data [Line Items] |  |  |
Revenues | 376,579 | 349,039 | 331,538
Depreciation, depletion and amortization | 67,802 | 66,750 | 62,998
Operating income (loss) | 79,655 | 66,335 | 63,434
Interest expense | 28,526 | 26,712 | 26,699
Income taxes | (5,420) | (7,626) | (11,636)
Capital expenditures | 133,970 | 82,427 | 114,676
Total assets | 1,856,258 | 1,810,695 | 2,123,693
Property, Plant and Equipment, Gross | 2,276,613 | 2,295,646 | 2,323,403
Natural gas distribution |  |  |
Business segment data [Line Items] |  |  |
Revenues | 1,273,249 | 971,364 | 847,651
Depreciation, depletion and amortization | 89,466 | 86,065 | 84,580
Operating income (loss) | 91,889 | 89,173 | 73,082
Interest expense | 42,126 | 37,265 | 36,798
Income taxes | 7,805 | 8,366 | 5,746
Capital expenditures | 240,064 | 170,411 | 193,048
Total assets | 3,214,452 | 2,929,519 | 2,302,770
Property, Plant and Equipment, Gross | 3,208,060 | 3,015,164 | 2,868,853
Pipeline |  |  |
Business segment data [Line Items] |  |  |
Revenues | 96,567 | 82,858 | 85,346
Depreciation, depletion and amortization | 26,857 | 20,569 | 21,669
Operating income (loss) | 55,466 | 48,078 | 49,436
Interest expense | 11,318 | 7,010 | 7,622
Income taxes | 10,212 | 9,594 | 7,650
Capital expenditures | 61,923 | 234,803 | 62,224
Total assets | 961,893 | 913,945 | 703,377
Property, Plant and Equipment, Gross | 1,108,141 | 1,051,868 | 821,697
Construction materials and contracting |  |  |
Business segment data [Line Items] |  |  |
Revenues | 2,533,713 | 2,228,306 | 2,177,585
Depreciation, depletion and amortization | 117,798 | 100,974 | 89,626
Operating income (loss) | 194,295 | 191,077 | 214,498
Interest expense | 30,121 | 19,218 | 20,577
Income taxes | 42,601 | 43,459 | 47,431
Capital expenditures | 181,917 | 417,524 | 191,635
Total assets | 2,268,970 | 2,161,653 | 1,798,493
Property, Plant and Equipment, Gross | 2,489,408 | 2,347,696 | 2,028,476
Construction services |  |  |
Business segment data [Line Items] |  |  |
Revenues | 2,693,756 | 2,049,082 | 2,090,685
Depreciation, depletion and amortization | 21,468 | 20,270 | 23,523
Operating income (loss) | 164,644 | 145,754 | 147,644
Interest expense | 6,354 | 3,540 | 4,095
Income taxes | 40,788 | 35,426 | 35,797
Capital expenditures | 36,413 | 29,140 | 83,651
Total assets | 1,126,323 | 845,262 | 818,662
Property, Plant and Equipment, Gross | 245,111 | 225,758 | 220,796
Other |  |  |
Business segment data [Line Items] |  |  |
Revenues | 0 | 84 | (55)
Depreciation, depletion and amortization | 4,435 | 4,586 | 2,704
Operating income (loss) | (11,996) | (6,198) | (3,169)
Interest expense | 1,465 | 342 | 883
Income taxes | (1,203) | (299) | (398)
Capital expenditures | 2,272 | 1,501 | 3,045
Total assets | 232,885 | 249,361 | 306,377
Property, Plant and Equipment, Gross | 36,705 | 36,717 | 37,545
Intersegment Eliminations |  |  |
Business segment data [Line Items] |  |  |
Revenues | (84,176) | (77,606) | (76,969)
Interest expense | (637) | (103) | (155)
Total assets | (1,184,512) | (992,084) | (711,216)
Intersegment Eliminations | Electric |  |  |
Business segment data [Line Items] |  |  |
Revenues | (494) | (543) | (491)
Intersegment Eliminations | Natural gas distribution |  |  |
Business segment data [Line Items] |  |  |
Revenues | (555) | (576) | (534)
Intersegment Eliminations | Pipeline |  |  |
Business segment data [Line Items] |  |  |
Revenues | (59,012) | (59,678) | (58,531)
Intersegment Eliminations | Construction materials and contracting |  |  |
Business segment data [Line Items] |  |  |
Revenues | (1,016) | (624) | (417)
Intersegment Eliminations | Construction services |  |  |
Business segment data [Line Items] |  |  |
Revenues | (5,494) | (2,555) | (5,038)
Intersegment Eliminations | Other |  |  |
Business segment data [Line Items] |  |  |
Revenues | (17,605) | (13,630) | (11,958)
Total Intersegment operating revenues |  |  |
Business segment data [Line Items] |  |  |
Revenues | 84,176 | 77,606 | 76,969
Regulated Operation |  |  |
Business segment data [Line Items] |  |  |
Revenues | 1,735,759 | 1,390,343 | 1,249,146
Income from continuing operations | 137,605 | 143,085 | 135,103
Regulated Operation | Electric |  |  |
Business segment data [Line Items] |  |  |
Revenues | 376,579 | 349,039 | 331,538
Income from continuing operations | 57,077 | 51,906 | 55,601
Regulated Operation | Natural gas distribution |  |  |
Business segment data [Line Items] |  |  |
Revenues | 1,273,249 | 971,364 | 847,651
Income from continuing operations | 45,171 | 51,596 | 44,049
Regulated Operation | Pipeline |  |  |
Business segment data [Line Items] |  |  |
Revenues | 85,931 | 69,940 | 69,957
Income from continuing operations | 35,357 | 39,583 | 35,453
Regulated Operation | Intersegment Eliminations |  |  |
Business segment data [Line Items] |  |  |
Revenues | 59,417 | 60,108 | 59,002
Regulated Operation | Intersegment Eliminations | Electric |  |  |
Business segment data [Line Items] |  |  |
Revenues | 494 | 543 | 491
Regulated Operation | Intersegment Eliminations | Natural gas distribution |  |  |
Business segment data [Line Items] |  |  |
Revenues | 555 | 576 | 534
Regulated Operation | Intersegment Eliminations | Pipeline |  |  |
Business segment data [Line Items] |  |  |
Revenues | 58,368 | 58,989 | 57,977
Nonregulated Operation |  |  |
Business segment data [Line Items] |  |  |
Revenues | 5,238,105 | 4,290,390 | 4,283,604
Income from continuing operations | 229,671 | 234,646 | 255,424
Nonregulated Operation | Pipeline |  |  |
Business segment data [Line Items] |  |  |
Revenues | 10,636 | 12,918 | 15,389
Income from continuing operations | (69) | 1,313 | 1,559
Nonregulated Operation | Construction materials and contracting |  |  |
Business segment data [Line Items] |  |  |
Revenues | 2,533,713 | 2,228,306 | 2,177,585
Income from continuing operations | 116,220 | 129,755 | 147,325
Nonregulated Operation | Construction services |  |  |
Business segment data [Line Items] |  |  |
Revenues | 2,693,756 | 2,049,082 | 2,090,685
Income from continuing operations | 124,781 | 109,402 | 109,721
Nonregulated Operation | Other |  |  |
Business segment data [Line Items] |  |  |
Revenues | 0 | 84 | (55)
Income from continuing operations | (11,261) | (5,824) | (3,181)
Nonregulated Operation | Intersegment Eliminations |  |  |
Business segment data [Line Items] |  |  |
Revenues | 24,759 | 17,498 | 17,967
Nonregulated Operation | Intersegment Eliminations | Pipeline |  |  |
Business segment data [Line Items] |  |  |
Revenues | 644 | 689 | 554
Nonregulated Operation | Intersegment Eliminations | Construction materials and contracting |  |  |
Business segment data [Line Items] |  |  |
Revenues | 1,016 | 624 | 417
Nonregulated Operation | Intersegment Eliminations | Construction services |  |  |
Business segment data [Line Items] |  |  |
Revenues | 5,494 | 2,555 | 5,038
Nonregulated Operation | Intersegment Eliminations | Other |  |  |
Business segment data [Line Items] |  |  |
Revenues | $ 17,605 | $ 13,630 | $ 11,958

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