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Business Segment Data - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating revenues | $ 315,036 |  |  | $ 289,694 |  |  | $ 1,341,055 | $ 1,222,440
Purchased natural gas sold | 58,514 |  |  | 53,377 |  |  | 471,728 | 406,569
Electric fuel and purchased power | 41,098 |  |  | 32,576 |  |  | 119,737 | 108,991
Operation and maintenance | 101,762 |  |  | 101,211 |  |  | 325,696 | 308,780
Depreciation and amortization | 52,046 |  |  | 49,835 |  |  | 155,160 | 149,292
Taxes, other than income | 21,776 |  |  | 17,849 |  |  | 85,699 | 77,731
Other income | 7,298 |  |  | 8,970 |  |  | 22,240 | 31,242
Interest expense | 26,417 |  |  | 27,337 |  |  | 78,684 | 80,349
Income tax expense (benefit) | 2,371 |  |  | 876 |  |  | 11,597 | 11,390
Income (loss) from continuing operations | 18,350 |  |  | 15,603 |  |  | 114,994 | 110,580
Discontinued operations, net of tax | (39) |  |  | 49,012 |  |  | (938) | 115,370
Net income (loss) | 18,311 | $ 13,780 | $ 81,965 | 64,615 | $ 60,436 | $ 100,898 | 114,056 | 225,950
Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating revenues | 319,535 |  |  | 293,660 |  |  | 1,389,191 | 1,265,850
Operating Segments | Electric |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating revenues | 117,662 |  |  | 108,468 |  |  | 327,808 | 315,385
Purchased natural gas sold | 0 |  |  | 0 |  |  | 0 | 0
Electric fuel and purchased power | 41,098 |  |  | 32,576 |  |  | 119,737 | 108,991
Operation and maintenance | 25,957 |  |  | 23,359 |  |  | 84,186 | 69,989
Depreciation and amortization | 17,479 |  |  | 16,848 |  |  | 52,055 | 49,685
Taxes, other than income | 4,713 |  |  | 3,606 |  |  | 14,176 | 13,222
Other income | 2,027 |  |  | 1,403 |  |  | 5,745 | 5,449
Interest expense | 7,639 |  |  | 7,646 |  |  | 23,140 | 22,367
Income tax expense (benefit) | 1,339 |  |  | 1,544 |  |  | (6,646) | (1,109)
Income (loss) from continuing operations | 21,464 |  |  | 24,292 |  |  | 46,905 | 57,689
Discontinued operations, net of tax | 0 |  |  | 0 |  |  | 0 | 0
Net income (loss) | 21,464 |  |  | 24,292 |  |  | 46,905 | 57,689
Operating Segments | Natural gas distribution |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating revenues | 144,215 |  |  | 133,590 |  |  | 890,257 | 794,519
Purchased natural gas sold | 58,514 |  |  | 53,377 |  |  | 471,728 | 406,569
Electric fuel and purchased power | 0 |  |  | 0 |  |  | 0 | 0
Operation and maintenance | 56,531 |  |  | 54,785 |  |  | 180,471 | 169,034
Depreciation and amortization | 26,558 |  |  | 25,055 |  |  | 79,151 | 76,081
Taxes, other than income | 13,375 |  |  | 11,180 |  |  | 60,938 | 55,130
Other income | 3,850 |  |  | 5,985 |  |  | 12,246 | 19,506
Interest expense | 14,686 |  |  | 15,901 |  |  | 43,307 | 46,925
Income tax expense (benefit) | (7,612) |  |  | (7,130) |  |  | 519 | (253)
Income (loss) from continuing operations | (18,213) |  |  | (17,481) |  |  | 19,089 | 17,581
Discontinued operations, net of tax | 0 |  |  | 0 |  |  | 0 | 0
Net income (loss) | (18,213) |  |  | (17,481) |  |  | 19,089 | 17,581
Operating Segments | Pipeline |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating revenues | 53,159 |  |  | 47,635 |  |  | 122,990 | 112,518
Purchased natural gas sold | 0 |  |  | 0 |  |  | 0 | 0
Electric fuel and purchased power | 0 |  |  | 0 |  |  | 0 | 0
Operation and maintenance | 21,016 |  |  | 18,969 |  |  | 62,608 | 56,461
Depreciation and amortization | 8,009 |  |  | 7,369 |  |  | 23,954 | 21,806
Taxes, other than income | 3,688 |  |  | 3,006 |  |  | 10,585 | 9,108
Other income | 880 |  |  | 1,117 |  |  | 2,804 | 4,616
Interest expense | 2,447 |  |  | 2,564 |  |  | 8,703 | 7,466
Income tax expense (benefit) | 4,782 |  |  | 4,688 |  |  | 14,246 | 14,493
Income (loss) from continuing operations | 16,758 |  |  | 15,184 |  |  | 49,385 | 47,501
Discontinued operations, net of tax | 0 |  |  | 0 |  |  | 0 | 0
Net income (loss) | 16,758 |  |  | 15,184 |  |  | 49,385 | 47,501
Operating Segments | Other |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating revenues | 0 |  |  | 1 |  |  | 0 | 18
Purchased natural gas sold | 0 |  |  | 0 |  |  | 0 | 0
Electric fuel and purchased power | 0 |  |  | 0 |  |  | 0 | 0
Operation and maintenance | (1,742) |  |  | 4,098 |  |  | (1,569) | 13,296
Depreciation and amortization | 0 |  |  | 563 |  |  | 0 | 1,720
Taxes, other than income | 0 |  |  | 57 |  |  | 0 | 271
Other income | 541 |  |  | 465 |  |  | 1,445 | 1,671
Interest expense | 1,645 |  |  | 1,226 |  |  | 3,534 | 3,591
Income tax expense (benefit) | 3,862 |  |  | 1,774 |  |  | 3,478 | (1,741)
Income (loss) from continuing operations | (1,659) |  |  | (6,392) |  |  | (385) | (12,191)
Discontinued operations, net of tax | (39) |  |  | 49,012 |  |  | (938) | 115,370
Net income (loss) | (1,698) |  |  | 42,620 |  |  | (1,323) | 103,179
Intersegment eliminations |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating revenues | (4,681) |  |  | (3,988) |  |  | (48,676) | (43,492)
Purchased natural gas sold | (4,226) |  |  | (3,888) |  |  | (47,300) | (42,958)
Operation and maintenance | (455) |  |  | (100) |  |  | (1,376) | (534)
Other income | (1,687) |  |  | (4,031) |  |  | (3,947) | (12,945)
Interest expense | (1,687) |  |  | (4,031) |  |  | (3,947) | (12,945)
Intersegment eliminations | Electric |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating revenues | (138) |  |  | (12) |  |  | (457) | (71)
Purchased natural gas sold | 0 |  |  | 0 |  |  | 0 | 0
Operation and maintenance | (138) |  |  | (12) |  |  | (457) | (71)
Other income | 0 |  |  | 0 |  |  | 0 | 0
Interest expense | 0 |  |  | 0 |  |  | 0 | 0
Intersegment eliminations | Natural gas distribution |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating revenues | (92) |  |  | (31) |  |  | (278) | (108)
Purchased natural gas sold | (4,226) |  |  | (3,888) |  |  | (47,300) | (42,958)
Operation and maintenance | (92) |  |  | (31) |  |  | (278) | (108)
Other income | 0 |  |  | 0 |  |  | 0 | 0
Interest expense | 0 |  |  | 0 |  |  | 0 | 0
Intersegment eliminations | Pipeline |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating revenues | (4,269) |  |  | (3,924) |  |  | (47,401) | (43,249)
Purchased natural gas sold | 0 |  |  | 0 |  |  | 0 | 0
Operation and maintenance | (43) |  |  | (36) |  |  | (101) | (291)
Other income | (122) |  |  | (237) |  |  | (334) | (692)
Interest expense | (1,687) |  |  | (1,097) |  |  | (3,947) | (3,949)
Intersegment eliminations | Other |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating revenues | (182) |  |  | (21) |  |  | (540) | (64)
Purchased natural gas sold | 0 |  |  | 0 |  |  | 0 | 0
Operation and maintenance | (182) |  |  | (21) |  |  | (540) | (64)
Other income | (1,565) |  |  | (3,794) |  |  | (3,613) | (12,253)
Interest expense | $ 0 |  |  | $ (2,934) |  |  | $ 0 | $ (8,996)

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