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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)

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