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Business Segment Information: Information Relating to Segments Statement of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Sep. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information |  |  |  |  |
Revenue from contracts with customers |  |  | $ 1,930,834 | $ 1,680,804 | $ 1,726,392
Revenue |  |  | 1,949,102 | 1,696,941 | 1,734,900
Fuel, purchased power and cost of natural gas sold |  |  | 741,934 | 492,404 | 570,829
Operations and maintenance, including taxes |  |  | 561,786 | 551,777 | 548,909
Depreciation, depletion and amortization |  |  | 235,953 | 224,457 | 209,120
Operating income |  |  | 409,429 | 428,303 | 406,042
Interest expense |  |  | (152,404) | (143,470) | (137,659)
Impairment of investment | $ (6,900) | $ (20,000) | 0 | (6,859) | (19,741)
Other income (expense), net |  |  | 1,404 | (2,293) | (5,740)
Income tax (expense) |  |  | (7,169) | (32,918) | (29,580)
Net income |  |  | 251,260 | 242,763 | 213,322
Net income attributable to non-controlling interest |  |  | (14,516) | (15,155) | (14,012)
Net income available for common stock |  |  | 236,744 | 227,608 | 199,310
Electric Utilities |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue from contracts with customers |  |  | 836,923 | 732,681 | 731,231
Revenue |  |  | 842,258 | 738,857 | 739,355
Fuel, purchased power and cost of natural gas sold |  |  | 248,018 | 138,572 | 145,972
Operations and maintenance, including taxes |  |  | 260,036 | 265,679 | 259,167
Depreciation, depletion and amortization |  |  | 131,528 | 123,632 | 116,539
Adjusted operating income (loss) |  |  | 202,676 | 210,974 | 217,677
Gas Utilities |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue from contracts with customers |  |  | 1,111,539 | 964,421 | 1,009,646
Revenue |  |  | 1,124,865 | 974,670 | 1,010,030
Fuel, purchased power and cost of natural gas sold |  |  | 494,738 | 354,645 | 425,898
Operations and maintenance, including taxes |  |  | 314,810 | 303,577 | 301,844
Depreciation, depletion and amortization |  |  | 104,160 | 100,559 | 92,317
Adjusted operating income (loss) |  |  | 211,157 | 215,889 | 189,971
Intercompany Eliminations |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue from contracts with customers |  |  | (17,628) | (16,298) | (14,485)
Revenue |  |  | (18,021) | (16,586) | (14,485)
Fuel, purchased power and cost of natural gas sold |  |  | (918) | (896) | (1,310)
Operations and maintenance, including taxes |  |  | (306,325) | (301,980) | (298,902)
Depreciation, depletion and amortization |  |  | (26,573) | (24,884) | (21,801)
Adjusted operating income (loss) |  |  | (40,552) | (41,969) | (36,676)
Corporate, Non-Segment |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue |  |  | 356,347 | 353,143 | 344,204
Fuel, purchased power and cost of natural gas sold |  |  | 96 | 83 | 269
Operations and maintenance, including taxes |  |  | 293,265 | 284,501 | 286,800
Depreciation, depletion and amortization |  |  | 26,838 | 25,150 | 22,065
Adjusted operating income (loss) |  |  | 36,148 | 43,409 | 35,070
Other revenues |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue |  |  | 18,268 | 16,137 | 8,508
Other revenues | Electric Utilities |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue |  |  | 5,335 | 6,176 | 8,124
Other revenues | Gas Utilities |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue |  |  | 13,326 | 10,249 | 384
Other revenues | Intercompany Eliminations |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue |  |  | (393) | (288) | 0
External Customers |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue from contracts with customers |  |  | 1,930,834 | 1,680,804 | 1,726,392
Revenue |  |  | 1,949,102 | 1,696,941 | 1,734,900
External Customers | Electric Utilities |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue from contracts with customers |  |  | 825,404 | 721,108 | 719,205
Revenue |  |  | 830,740 | 727,283 | 727,329
External Customers | Gas Utilities |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue from contracts with customers |  |  | 1,105,430 | 959,696 | 1,007,187
Revenue |  |  | 1,118,362 | 969,658 | 1,007,571
External Customers | Other revenues |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue |  |  | 18,268 | 16,137 | 8,508
External Customers | Other revenues | Electric Utilities |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue |  |  | 5,336 | 6,175 | 8,124
External Customers | Other revenues | Gas Utilities |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue |  |  | 12,932 | 9,962 | 384
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 |  |  | 11,518 | 11,574 | 12,026
Revenue |  |  | 11,518 | 11,574 | 12,026
Intercompany Customers | Gas Utilities |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue from contracts with customers |  |  | 6,110 | 4,724 | 2,459
Revenue |  |  | 6,503 | 5,012 | 2,459
Intercompany Customers | Intercompany Eliminations |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue from contracts with customers |  |  | (17,824) | (16,465) | (14,715)
Revenue |  |  | (374,368) | (369,729) | (358,689)
Intercompany Customers | Corporate, Non-Segment |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue from contracts with customers |  |  | 196 | 167 | 230
Revenue |  |  | 356,347 | 353,143 | 344,204
Intercompany Customers | Other revenues |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue |  |  | 0 | 0 | 0
Intercompany Customers | Other revenues | Electric Utilities |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue |  |  | 0 | 0 | 0
Intercompany Customers | Other revenues | Gas Utilities |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue |  |  | 393 | 288 | 0
Intercompany Customers | Other revenues | Intercompany Eliminations |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue |  |  | (356,544) | (353,264) | (343,974)
Intercompany Customers | Other revenues | Corporate, Non-Segment |  |  |  |  |
Segment Reporting Information |  |  |  |  |
Revenue |  |  | $ 356,151 | $ 352,976 | $ 343,974

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