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Business Segment Data - Schedule of Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Operating revenues  $ 674,833 $ 588,275
External operation and maintenance 111,047 107,614
Purchased natural gas sold 317,157 258,602
Electric fuel and purchased power 43,748 39,723
Depreciation and amortization 51,261 49,767
Taxes, other than income 38,757 35,913
Other income (4,997) (11,909)
Interest expense 26,822 26,511
Income tax expense (benefit) 8,571 7,319
Income from continuing operations 82,467 74,735
Discontinued operations, net of tax (502) 26,163
Net income 81,965 100,898
Operating Segments    
Segment Reporting Information [Line Items]    
Operating revenues  708,441 618,602
Operating Segments | Electric    
Segment Reporting Information [Line Items]    
Operating revenues  112,261 107,743
External operation and maintenance 28,407 23,530
Purchased natural gas sold 0 0
Electric fuel and purchased power 43,748 39,723
Depreciation and amortization 17,183 16,616
Taxes, other than income 4,815 5,086
Other income (992) (1,982)
Interest expense 7,887 7,495
Income tax expense (benefit) (3,731) (594)
Income from continuing operations 14,944 17,869
Discontinued operations, net of tax 0 0
Net income 14,944 17,869
Operating Segments | Natural gas distribution    
Segment Reporting Information [Line Items]    
Operating revenues  539,248 459,484
External operation and maintenance 63,484 59,330
Purchased natural gas sold 317,157 258,602
Electric fuel and purchased power 0 0
Depreciation and amortization 26,122 25,478
Taxes, other than income 30,628 27,591
Other income (3,301) (8,170)
Interest expense 14,876 15,660
Income tax expense (benefit) 12,301 10,678
Income from continuing operations 44,658 40,070
Discontinued operations, net of tax 0 0
Net income 44,658 40,070
Operating Segments | Pipeline    
Segment Reporting Information [Line Items]    
Operating revenues  23,323 21,032
External operation and maintenance 19,239 18,414
Purchased natural gas sold 0 0
Electric fuel and purchased power 0 0
Depreciation and amortization 7,956 7,119
Taxes, other than income 3,314 3,094
Other income (307) (769)
Interest expense 3,121 2,193
Income tax expense (benefit) 5,127 4,510
Income from continuing operations 17,210 15,058
Discontinued operations, net of tax 0 0
Net income 17,210 15,058
Operating Segments | Other    
Segment Reporting Information [Line Items]    
Operating revenues  1 16
External operation and maintenance (83) 6,340
Purchased natural gas sold 0 0
Electric fuel and purchased power 0 0
Depreciation and amortization 0 554
Taxes, other than income 0 142
Other income (397) (988)
Interest expense 938 1,163
Income tax expense (benefit) (5,126) (7,275)
Income from continuing operations 5,655 1,738
Discontinued operations, net of tax (502) 26,163
Net income 5,153 27,901
Intersegment eliminations    
Segment Reporting Information [Line Items]    
Operating revenues  (33,787) (30,364)
External operation and maintenance (464) (119)
Purchased natural gas sold (33,323) (30,245)
Other income 1,109 4,511
Interest expense (1,109) (4,511)
Intersegment eliminations | Electric    
Segment Reporting Information [Line Items]    
Operating revenues  (178) (12)
External operation and maintenance (178) (12)
Purchased natural gas sold 0 0
Other income 0 0
Interest expense 0 0
Intersegment eliminations | Natural gas distribution    
Segment Reporting Information [Line Items]    
Operating revenues  (94) (41)
External operation and maintenance (94) (41)
Purchased natural gas sold (33,323) (30,245)
Other income 0 0
Interest expense 0 0
Intersegment eliminations | Pipeline    
Segment Reporting Information [Line Items]    
Operating revenues  (33,337) (30,290)
External operation and maintenance (14) (45)
Purchased natural gas sold 0 0
Other income 123 123
Interest expense (1,109) (1,781)
Intersegment eliminations | Other    
Segment Reporting Information [Line Items]    
Operating revenues  (178) (21)
External operation and maintenance (178) (21)
Purchased natural gas sold 0 0
Other income 986 4,388
Interest expense $ 0 $ (2,730)