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Business Segment Information: Information Relating to Segments Statement of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information      
Revenue from contracts with customers $ 2,542,856 $ 1,930,834 $ 1,680,804
Revenue 2,551,816 1,949,102 1,696,941
Fuel, purchased power and cost of natural gas sold 1,230,550 741,934 492,404
Operations and maintenance, including taxes 615,113 561,786 551,777
Depreciation, depletion and amortization 250,909 235,953 224,457
Adjusted operating income (loss) 455,244    
Operating income (loss) 455,244 409,429 428,303
Interest expense, net (160,989) (152,404) (143,470)
Impairment of investment 0 0 (6,859)
Other income (expense), net 1,708 1,404 (2,293)
Income tax expense (25,205) (7,169) (32,918)
Net income 270,758 251,260 242,763
Net income attributable to non-controlling interest (12,371) (14,516) (15,155)
Net income available for common stock 258,387 236,744 227,608
Electric Utilities      
Segment Reporting Information      
Revenue from contracts with customers 894,614 836,923 732,681
Revenue 900,162 842,258 738,857
Fuel, purchased power and cost of natural gas sold 266,284 248,018 138,572
Operations and maintenance, including taxes 283,654 260,036 265,679
Depreciation, depletion and amortization 135,966 131,528 123,632
Adjusted operating income (loss) 214,258 202,676 210,974
Gas Utilities      
Segment Reporting Information      
Revenue from contracts with customers 1,665,249 1,111,539 964,421
Revenue 1,669,090 1,124,865 974,670
Fuel, purchased power and cost of natural gas sold 965,108 494,738 354,645
Operations and maintenance, including taxes 345,143 314,810 303,577
Depreciation, depletion and amortization 114,679 104,160 100,559
Adjusted operating income (loss) 244,160 211,157 215,889
Corporate, Non-Segment      
Segment Reporting Information      
Revenue 368,739 356,347 353,143
Fuel, purchased power and cost of natural gas sold (11) 96 83
Operations and maintenance, including taxes 309,773 293,265 284,501
Depreciation, depletion and amortization 26,964 26,838 25,150
Adjusted operating income (loss) 32,013 36,148 43,409
Intercompany Eliminations      
Segment Reporting Information      
Revenue from contracts with customers (17,007) (17,628) (16,298)
Revenue (17,436) (18,021) (16,586)
Fuel, purchased power and cost of natural gas sold (831) (918) (896)
Operations and maintenance, including taxes (323,457) (306,325) (301,980)
Depreciation, depletion and amortization (26,700) (26,573) (24,884)
Adjusted operating income (loss) (35,187) (40,552) (41,969)
Other revenues      
Segment Reporting Information      
Revenue 8,960 18,268 16,137
Other revenues | Electric Utilities      
Segment Reporting Information      
Revenue 5,548 5,335 6,176
Other revenues | Gas Utilities      
Segment Reporting Information      
Revenue 3,841 13,326 10,249
Other revenues | Intercompany Eliminations      
Segment Reporting Information      
Revenue (429) (393) (288)
External Customers      
Segment Reporting Information      
Revenue from contracts with customers 2,542,856 1,930,834 1,680,804
Revenue 2,551,816 1,949,102 1,696,941
External Customers | Electric Utilities      
Segment Reporting Information      
Revenue from contracts with customers 882,899 825,404 721,108
Revenue 888,447 830,740 727,283
External Customers | Gas Utilities      
Segment Reporting Information      
Revenue from contracts with customers 1,659,957 1,105,430 959,696
Revenue 1,663,369 1,118,362 969,658
External Customers | Other revenues      
Segment Reporting Information      
Revenue 8,960 18,268 16,137
External Customers | Other revenues | Electric Utilities      
Segment Reporting Information      
Revenue 5,548 5,336 6,175
External Customers | Other revenues | Gas Utilities      
Segment Reporting Information      
Revenue 3,412 12,932 9,962
Intercompany Customers      
Segment Reporting Information      
Revenue from contracts with customers 0 0 0
Revenue 0 0 0
Intercompany Customers | Electric Utilities      
Segment Reporting Information      
Revenue from contracts with customers 11,715 11,518 11,574
Revenue 11,715 11,518 11,574
Intercompany Customers | Gas Utilities      
Segment Reporting Information      
Revenue from contracts with customers 5,292 6,110 4,724
Revenue 5,721 6,503 5,012
Intercompany Customers | Corporate, Non-Segment      
Segment Reporting Information      
Revenue from contracts with customers 538 196 167
Revenue 368,739 356,347 353,143
Intercompany Customers | Intercompany Eliminations      
Segment Reporting Information      
Revenue from contracts with customers (17,545) (17,824) (16,465)
Revenue (386,175) (374,368) (369,729)
Intercompany Customers | Other revenues      
Segment Reporting Information      
Revenue 0 0 0
Intercompany Customers | Other revenues | Electric Utilities      
Segment Reporting Information      
Revenue   0 0
Intercompany Customers | Other revenues | Gas Utilities      
Segment Reporting Information      
Revenue 429 393 288
Intercompany Customers | Other revenues | Corporate, Non-Segment      
Segment Reporting Information      
Revenue 368,201 356,151 352,976
Intercompany Customers | Other revenues | Intercompany Eliminations      
Segment Reporting Information      
Revenue $ (368,630) $ (356,544) $ (353,264)