v3.26.1
Segment Information (Company's Reportable Segments And Reconciliations To Consolidated Amounts) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting Information [Line Items]            
Operating revenues $ 530,854   $ 514,907   $ 1,392,613 $ 1,298,533
Operations and maintenance expense 153,635   148,510   329,430 286,334
Purchased gas 46,201   56,735   284,816 241,376
Depreciation and amortization 113,292   103,519   224,021 202,896
Taxes other than income taxes 24,453   20,872   50,433 43,751
Interest expense, net 88,601   79,508   174,297 161,344
Allowance for funds used during construction (5,739)   (7,027)   (11,499) (12,859)
Other segment items 1,295   391   1,220 98
Provision for income taxes (benefit) 3,391   4,572   9,778 (16,023)
Net income (loss) 105,725 $ 224,392 107,827 $ 283,789 330,117 391,616
Capital expenditures         662,167  
Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Capital expenditures           612,629
Total Reportable Segments [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 526,344   509,043   1,377,777 1,279,342
Total Reportable Segments [Member] | Intersegment Eliminations [Member]            
Segment Reporting Information [Line Items]            
Operating revenues (479)   (560)   (1,433) (1,906)
Total Reportable Segments [Member] | Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 526,823   509,603   1,379,210 1,281,248
Operations and maintenance expense 159,298   149,935   318,653 295,028
Purchased gas 44,338   53,532   277,640 230,491
Depreciation and amortization 112,819   103,030   223,090 201,998
Taxes other than income taxes 23,745   20,146   48,060 41,492
Interest expense, net 68,052   62,865   135,678 125,568
Allowance for funds used during construction (5,739)   (7,027)   (11,499) (12,859)
Other segment items (2,062)   (110)   (1,563) (210)
Provision for income taxes (benefit) 18,728   9,236   7,959 (15,683)
Net income (loss) 107,644   117,996   381,192 415,423
Capital expenditures         662,167 612,629
Regulated Water [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 357,544   332,282   680,519 633,130
Regulated Water [Member] | Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 357,544   332,282   680,519 633,130
Operations and maintenance expense 109,354   100,149   212,476 189,567
Depreciation and amortization 72,027   64,731   141,718 125,360
Taxes other than income taxes 18,259   17,655   36,545 33,247
Interest expense, net 39,974   37,032   79,855 73,595
Allowance for funds used during construction (4,112)   (5,622)   (8,812) (10,354)
Other segment items (1,882)   17   (1,200) 44
Provision for income taxes (benefit) 20,442   17,840   35,137 13,269
Net income (loss) 103,482   100,480   184,800 208,402
Capital expenditures         363,627 316,378
Regulated Natural Gas [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 168,800   176,761   697,258 646,212
Regulated Natural Gas [Member] | Intersegment Eliminations [Member]            
Segment Reporting Information [Line Items]            
Operating revenues (479)   (560)   (1,433) (1,906)
Regulated Natural Gas [Member] | Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 169,279   177,321   698,691 648,118
Operations and maintenance expense 49,944   49,786   106,177 105,461
Purchased gas 44,338   53,532   277,640 230,491
Depreciation and amortization 40,792   38,299   81,372 76,638
Taxes other than income taxes 5,486   2,491   11,515 8,245
Interest expense, net 28,078   25,833   55,823 51,973
Allowance for funds used during construction (1,627)   (1,405)   (2,687) (2,505)
Other segment items (180)   (127)   (363) (254)
Provision for income taxes (benefit) (1,714)   (8,604)   (27,178) (28,952)
Net income (loss) 4,162   17,516   196,392 207,021
Capital expenditures         298,540 296,251
Other And Eliminations [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 4,510   5,864   14,836 19,191
Other And Eliminations [Member] | Intersegment Eliminations [Member]            
Segment Reporting Information [Line Items]            
Operating revenues (479)   (560)   (1,433) (1,906)
Other And Eliminations [Member] | Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Operating revenues 4,031   5,304   13,403 17,285
Operations and maintenance expense (5,663)   (1,425)   10,777 (8,694)
Purchased gas 1,863   3,203   7,176 10,885
Depreciation and amortization 473   489   931 898
Taxes other than income taxes 708   726   2,373 2,259
Interest expense, net 20,549   16,643   38,619 35,776
Other segment items 3,357   501   2,783 308
Provision for income taxes (benefit) (15,337)   (4,664)   1,819 (340)
Net income (loss) $ (1,919)   $ (10,169)   $ (51,075) $ (23,807)