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Business Segment Data - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | $ 351,186 |  | $ 344,471 |  | $ 1,026,019 | $ 932,746
Purchased natural gas sold | 96,057 |  | 94,591 |  | 413,214 | 353,192
Electric fuel and purchased power | 34,891 |  | 36,692 |  | 78,639 | 76,415
External operation and maintenance | 112,887 |  | 99,955 |  | 223,934 | 207,570
Depreciation and amortization | 51,853 |  | 49,690 |  | 103,114 | 99,456
Taxes, other than income | 25,166 |  | 23,969 |  | 63,923 | 59,883
Other income | 9,945 |  | 10,363 |  | 14,942 | 22,273
Interest expense | 25,445 |  | 26,500 |  | 52,267 | 53,012
Income tax expense (benefit) | 655 |  | 3,195 |  | 9,226 | 10,514
Income (loss) from continuing operations | 14,177 |  | 20,242 |  | 96,644 | 94,977
Discontinued operations, net of tax | (397) |  | 40,194 |  | (899) | 66,357
Net income (loss) | 13,780 | $ 81,965 | 60,436 | $ 100,898 | 95,745 | 161,334
Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 361,215 |  | 353,587 |  | 1,069,656 | 972,190
Operating Segments | Electric |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 97,886 |  | 99,173 |  | 210,147 | 206,916
Purchased natural gas sold | 0 |  | 0 |  | 0 | 0
Electric fuel and purchased power | 34,891 |  | 36,692 |  | 78,639 | 76,415
External operation and maintenance | 29,823 |  | 23,100 |  | 58,230 | 46,631
Depreciation and amortization | 17,393 |  | 16,220 |  | 34,576 | 32,836
Taxes, other than income | 4,648 |  | 4,530 |  | 9,463 | 9,616
Other income | 2,726 |  | 2,065 |  | 3,718 | 4,047
Interest expense | 7,614 |  | 7,226 |  | 15,501 | 14,722
Income tax expense (benefit) | (4,254) |  | (2,057) |  | (7,985) | (2,652)
Income (loss) from continuing operations | 10,497 |  | 15,527 |  | 25,441 | 33,396
Discontinued operations, net of tax | 0 |  | 0 |  | 0 | 0
Net income (loss) | 10,497 |  | 15,527 |  | 25,441 | 33,396
Operating Segments | Natural gas distribution |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 206,794 |  | 201,445 |  | 746,041 | 660,930
Purchased natural gas sold | 96,057 |  | 94,591 |  | 413,214 | 353,192
Electric fuel and purchased power | 0 |  | 0 |  | 0 | 0
External operation and maintenance | 60,456 |  | 54,919 |  | 123,939 | 114,249
Depreciation and amortization | 26,471 |  | 25,548 |  | 52,593 | 51,026
Taxes, other than income | 16,935 |  | 16,358 |  | 47,563 | 43,950
Other income | 5,095 |  | 5,350 |  | 8,396 | 13,521
Interest expense | 13,745 |  | 15,364 |  | 28,621 | 31,024
Income tax expense (benefit) | (4,170) |  | (3,803) |  | 8,131 | 6,876
Income (loss) from continuing operations | (7,356) |  | (5,007) |  | 37,302 | 35,063
Discontinued operations, net of tax | 0 |  | 0 |  | 0 | 0
Net income (loss) | (7,356) |  | (5,007) |  | 37,302 | 35,063
Operating Segments | Pipeline |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 46,507 |  | 43,851 |  | 69,831 | 64,883
Purchased natural gas sold | 0 |  | 0 |  | 0 | 0
Electric fuel and purchased power | 0 |  | 0 |  | 0 | 0
External operation and maintenance | 22,352 |  | 19,079 |  | 41,592 | 37,494
Depreciation and amortization | 7,989 |  | 7,318 |  | 15,945 | 14,436
Taxes, other than income | 3,583 |  | 3,007 |  | 6,897 | 6,102
Other income | 1,616 |  | 2,729 |  | 1,923 | 3,498
Interest expense | 3,135 |  | 2,708 |  | 6,256 | 4,901
Income tax expense (benefit) | 4,337 |  | 5,295 |  | 9,464 | 9,805
Income (loss) from continuing operations | 15,417 |  | 17,259 |  | 32,627 | 32,317
Discontinued operations, net of tax | 0 |  | 0 |  | 0 | 0
Net income (loss) | 15,417 |  | 17,259 |  | 32,627 | 32,317
Operating Segments | Other |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | (1) |  | 2 |  | 0 | 17
Purchased natural gas sold | 0 |  | 0 |  | 0 | 0
Electric fuel and purchased power | 0 |  | 0 |  | 0 | 0
External operation and maintenance | 256 |  | 2,857 |  | 173 | 9,196
Depreciation and amortization | 0 |  | 604 |  | 0 | 1,158
Taxes, other than income | 0 |  | 74 |  | 0 | 215
Other income | 508 |  | 219 |  | 905 | 1,207
Interest expense | 951 |  | 1,202 |  | 1,889 | 2,365
Income tax expense (benefit) | 4,742 |  | 3,760 |  | (384) | (3,515)
Income (loss) from continuing operations | (4,381) |  | (7,537) |  | 1,274 | (5,799)
Discontinued operations, net of tax | (397) |  | 40,194 |  | (899) | 66,357
Net income (loss) | (4,778) |  | 32,657 |  | 375 | 60,558
Intersegment eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | (10,208) |  | (9,138) |  | (43,995) | (39,503)
Purchased natural gas sold | (9,751) |  | (8,825) |  | (43,074) | (39,071)
External operation and maintenance | (457) |  | (313) |  | (921) | (432)
Other income | (1,151) |  | (4,403) |  | (2,260) | (8,914)
Interest expense | (1,151) |  | (4,403) |  | (2,260) | (8,914)
Intersegment eliminations | Electric |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | (140) |  | (48) |  | (318) | (60)
Purchased natural gas sold | 0 |  | 0 |  | 0 | 0
External operation and maintenance | (140) |  | (48) |  | (318) | (59)
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) |  | (35) |  | (187) | (76)
Purchased natural gas sold | (9,751) |  | (8,825) |  | (43,074) | (39,071)
External operation and maintenance | (92) |  | (35) |  | (187) | (76)
Other income | 0 |  | 0 |  | 0 | 0
Interest expense | 0 |  | 0 |  | 0 | 0
Intersegment eliminations | Pipeline |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | (9,796) |  | (9,035) |  | (43,132) | (39,325)
Purchased natural gas sold | 0 |  | 0 |  | 0 | 0
External operation and maintenance | (45) |  | (210) |  | (58) | (254)
Other income | (90) |  | (332) |  | (213) | (455)
Interest expense | (1,151) |  | (1,071) |  | (2,260) | (2,852)
Intersegment eliminations | Other |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | (180) |  | (20) |  | (358) | (42)
Purchased natural gas sold | 0 |  | 0 |  | 0 | 0
External operation and maintenance | (180) |  | (20) |  | (358) | (43)
Other income | (1,061) |  | (4,071) |  | (2,047) | (8,459)
Interest expense | $ 0 |  | $ (3,332) |  | $ 0 | $ (6,062)

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