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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