v3.25.2
Segment Information (Company's Segment Information, Continuing Operations) (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 $ 514,907   $ 434,406   $ 1,298,533 $ 1,046,475
Operations and maintenance expense 148,510   142,512   286,334 279,412
Purchased gas 56,735   33,728   241,376 163,403
Depreciation and amortization 103,519   90,646   202,896 180,450
Taxes other than income taxes 20,872   22,233   43,751 47,257
Interest expense, net 79,508   72,769   161,344 145,053
Allowance for funds used during construction (7,027)   (5,229)   (12,859) (9,910)
Gain on sale of other assets (256)   (203)   (493) (91,828)
Other segment items 647   701   591 259
Provision for income taxes (benefit) 4,572   1,864   (16,023) (8,778)
Net income (loss) 107,827 $ 283,789 75,385 $ 265,772 391,616 341,157
Capital expenditures         612,629 548,868
Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 514,907   434,406   1,298,533 1,046,475
Regulated Water [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 332,282   302,479   633,130 582,372
Regulated Water [Member] | Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 332,282   302,479   633,130 582,372
Operations and maintenance expense 100,149   95,575   189,567 186,258
Depreciation and amortization 64,731   57,625   125,360 114,819
Taxes other than income taxes 17,655   16,425   33,247 32,749
Interest expense, net 37,032   34,450   73,595 69,240
Allowance for funds used during construction (5,622)   (3,962)   (10,354) (7,650)
Gain on sale of other assets (256)   (197)   (493) (241)
Other segment items 273   379   537 299
Provision for income taxes (benefit) 17,840   14,505   13,269 35,315
Net income (loss) 100,480   87,679   208,402 151,583
Capital expenditures         316,378 302,085
Regulated Natural Gas [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 176,761   127,801   646,212 451,133
Regulated Natural Gas [Member] | Intersegment Eliminations [Member]            
Segment Reporting Information [Line Items]            
Operating revenues (560)   (387)   (1,906) (1,386)
Regulated Natural Gas [Member] | Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 177,321   128,188   648,118 452,519
Operations and maintenance expense 49,786   49,709   105,461 95,626
Purchased gas 53,532   32,680   230,491 158,222
Depreciation and amortization 38,299   32,632   76,638 65,043
Taxes other than income taxes 2,491   5,103   8,245 12,323
Interest expense, net 25,833   20,869   51,973 46,225
Allowance for funds used during construction (1,405)   (1,267)   (2,505) (2,260)
Gain on sale of other assets           (91,581)
Other segment items (127)   9   (254) (322)
Provision for income taxes (benefit) (8,604)   (9,830)   (28,952) (38,980)
Net income (loss) 17,516   (1,717)   207,021 208,223
Capital expenditures         296,251 246,783
Total Reportable Segments [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 509,043   430,280   1,279,342 1,033,505
Total Reportable Segments [Member] | Intersegment Eliminations [Member]            
Segment Reporting Information [Line Items]            
Operating revenues (560)   (387)   (1,906) (1,386)
Total Reportable Segments [Member] | Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 509,603   430,667   1,281,248 1,034,891
Operations and maintenance expense 149,935   145,284   295,028 281,884
Purchased gas 53,532   32,680   230,491 158,222
Depreciation and amortization 103,030   90,257   201,998 179,862
Taxes other than income taxes 20,146   21,528   41,492 45,072
Interest expense, net 62,865   55,319   125,568 115,465
Allowance for funds used during construction (7,027)   (5,229)   (12,859) (9,910)
Gain on sale of other assets (256)   (197)   (493) (91,822)
Other segment items 146   388   283 (23)
Provision for income taxes (benefit) 9,236   4,675   (15,683) (3,665)
Net income (loss) 117,996   85,962   415,423 359,806
Capital expenditures         612,629 548,868
Other And Eliminations [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 5,864   4,126   19,191 12,970
Other And Eliminations [Member] | Intersegment Eliminations [Member]            
Segment Reporting Information [Line Items]            
Operating revenues (560)   (387)   (1,906) (1,386)
Other And Eliminations [Member] | Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 5,304   3,739   17,285 11,584
Operations and maintenance expense (1,425)   (2,772)   (8,694) (2,472)
Purchased gas 3,203   1,048   10,885 5,181
Depreciation and amortization 489   389   898 588
Taxes other than income taxes 726   705   2,259 2,185
Interest expense, net 16,643   17,450   35,776 29,588
Gain on sale of other assets     (6)     (6)
Other segment items 501   313   308 282
Provision for income taxes (benefit) (4,664)   (2,811)   (340) (5,113)
Net income (loss) $ (10,169)   $ (10,577)   $ (23,807) $ (18,649)