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Segment Information (Company's Reportable Segments And Reconciliations To Consolidated Amounts) (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 $ 476,971     $ 435,255     $ 1,775,504 $ 1,481,730
Operations and maintenance expense 153,088     144,368     439,422 423,780
Purchased gas 22,506     19,095     263,882 182,498
Depreciation and amortization 107,066     92,601     309,962 273,051
Taxes other than income taxes 24,540     24,102     68,291 71,359
Interest expense, net 81,190     75,452     242,534 220,505
Allowance for funds used during construction (6,180)     (5,593)     (19,039) (15,503)
Gain on sale of other assets (176)     (239)     (669) (92,067)
Other segment items (1,439)     227     (848) 486
Provision for income taxes (benefit) 4,299     15,840     (11,724) 7,062
Net income (loss) 92,077 $ 107,827 $ 283,789 69,402 $ 75,385 $ 265,772 483,693 410,559
Capital expenditures             983,089 932,498
Regulated Water [Member]                
Segment Reporting Information [Line Items]                
Operating revenues 364,055     334,477     997,185 916,850
Capital expenditures             520,937  
Regulated Water [Member] | Operating Segments [Member]                
Segment Reporting Information [Line Items]                
Operating revenues 364,055     334,477     997,185 916,850
Operations and maintenance expense 105,681     96,369     295,248 282,627
Depreciation and amortization 65,195     57,877     190,555 172,696
Taxes other than income taxes 18,134     17,851     51,381 50,600
Interest expense, net 38,233     35,094     111,828 104,334
Allowance for funds used during construction (4,526)     (4,326)     (14,880) (11,976)
Gain on sale of other assets (176)     (239)     (669) (479)
Other segment items 227     287     764 585
Provision for income taxes (benefit) 19,273     19,289     32,542 54,604
Net income (loss) 122,014     112,275     330,416 263,859
Capital expenditures               495,259
Regulated Natural Gas [Member]                
Segment Reporting Information [Line Items]                
Operating revenues 107,933     96,299     754,145 547,432
Capital expenditures             462,152  
Regulated Natural Gas [Member] | Intersegment Eliminations [Member]                
Segment Reporting Information [Line Items]                
Operating revenues (517)     (432)     (2,423) (1,818)
Regulated Natural Gas [Member] | Operating Segments [Member]                
Segment Reporting Information [Line Items]                
Operating revenues 108,450     96,731     756,568 549,250
Operations and maintenance expense 47,453     49,002     152,914 144,628
Purchased gas 19,965     17,603     250,456 175,825
Depreciation and amortization 41,411     34,318     118,049 99,361
Taxes other than income taxes 5,688     5,546     13,933 17,869
Interest expense, net 26,197     22,121     78,170 68,346
Allowance for funds used during construction (1,654)     (1,267)     (4,159) (3,527)
Gain on sale of other assets               (91,581)
Other segment items (214)     (160)     (468) (482)
Provision for income taxes (benefit) (5,565)     228     (34,517) (38,752)
Net income (loss) (24,831)     (30,660)     182,190 177,563
Capital expenditures               436,807
Total Reportable Segments [Member]                
Segment Reporting Information [Line Items]                
Operating revenues 471,988     430,776     1,751,330 1,464,282
Total Reportable Segments [Member] | Intersegment Eliminations [Member]                
Segment Reporting Information [Line Items]                
Operating revenues (517)     (432)     (2,423) (1,818)
Total Reportable Segments [Member] | Operating Segments [Member]                
Segment Reporting Information [Line Items]                
Operating revenues 472,505     431,208     1,753,753 1,466,100
Operations and maintenance expense 153,134     145,371     448,162 427,255
Purchased gas 19,965     17,603     250,456 175,825
Depreciation and amortization 106,606     92,195     308,604 272,057
Taxes other than income taxes 23,822     23,397     65,314 68,469
Interest expense, net 64,430     57,215     189,998 172,680
Allowance for funds used during construction (6,180)     (5,593)     (19,039) (15,503)
Gain on sale of other assets (176)     (239)     (669) (92,060)
Other segment items 13     127     296 103
Provision for income taxes (benefit) 13,708     19,517     (1,975) 15,852
Net income (loss) 97,183     81,615     512,606 441,422
Capital expenditures             983,089 932,066
Other [Member]                
Segment Reporting Information [Line Items]                
Operating revenues 4,983     4,479     24,174 17,448
Other [Member] | Intersegment Eliminations [Member]                
Segment Reporting Information [Line Items]                
Operating revenues (517)     (432)     (2,423) (1,818)
Other [Member] | Eliminations And Reconciling Items [Member]                
Segment Reporting Information [Line Items]                
Operating revenues 4,466     4,047     21,751 15,630
Operations and maintenance expense (46)     (1,003)     (8,740) (3,475)
Purchased gas 2,541     1,492     13,426 6,673
Depreciation and amortization 460     406     1,358 994
Taxes other than income taxes 718     705     2,977 2,890
Interest expense, net 16,760     18,237     52,536 47,825
Gain on sale of other assets               (7)
Other segment items (1,452)     100     (1,144) 383
Provision for income taxes (benefit) (9,409)     (3,677)     (9,749) (8,790)
Net income (loss) $ (5,106)     $ (12,213)     $ (28,913) (30,863)
Capital expenditures               $ 432