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Business Segment Information: Information Relating to Segment Statement of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information            
Revenue from contracts with customers $ 470,324   $ 368,422   $ 1,292,093 $ 998,640
Revenues 474,195   372,572   1,297,765 1,006,004
Operating income 72,389   67,266   245,742 205,581
Interest expense, net (38,764)   (38,202)   (77,309) (75,802)
Other income (expense), net 1,563   (191)   2,267 75
Income tax benefit (expense) 658   (586)   (13,830) (1,080)
Net income 35,846 $ 121,024 28,287 $ 100,487 156,870 128,774
Net income attributable to non-controlling interest (2,431)   (3,126)   (5,929) (7,297)
Net income available for common stock 33,415   25,161   150,941 121,477
Inter-company Revenues            
Segment Reporting Information            
Revenue from contracts with customers (4,248)   (4,400)   (8,496) (8,799)
Revenues (4,353)   (4,494)   (8,713) (8,985)
Consolidation, Eliminations            
Segment Reporting Information            
Revenue from contracts with customers 0   0   0 0
Corporate and Other            
Segment Reporting Information            
Operating income (1,032)   (181)   (1,965) (3,303)
Electric Utilities            
Segment Reporting Information            
Revenue from contracts with customers 201,309   188,116   406,977 422,714
Revenues 204,379   191,016   410,917 426,420
Operating income 45,226   47,462   95,972 86,805
Gas Utilities            
Segment Reporting Information            
Revenue from contracts with customers 273,263   184,706   893,612 584,725
Revenues 274,169   186,050   895,561 588,569
Operating income 28,195   19,985   151,735 122,079
Other revenues            
Segment Reporting Information            
Revenues 3,871   4,150   5,672 7,364
Other revenues | Inter-company Revenues            
Segment Reporting Information            
Revenues (105)   (94)   (217) (186)
Other revenues | Consolidation, Eliminations            
Segment Reporting Information            
Revenues 0   0   0 0
Other revenues | Electric Utilities            
Segment Reporting Information            
Revenues 3,070   2,900   3,940 3,706
Other revenues | Gas Utilities            
Segment Reporting Information            
Revenues 906   1,344   1,949 3,844
External Customers            
Segment Reporting Information            
Revenue from contracts with customers 470,324   368,422   1,292,093 998,640
External Customers | Electric Utilities            
Segment Reporting Information            
Revenue from contracts with customers 198,380   185,235   401,119 416,954
External Customers | Gas Utilities            
Segment Reporting Information            
Revenue from contracts with customers 271,944   183,187   890,974 581,686
External Customers | Other revenues            
Segment Reporting Information            
Revenues 3,871   4,150   5,672 7,364
External Customers | Other revenues | Electric Utilities            
Segment Reporting Information            
Revenues 3,070   2,900   3,940 3,706
External Customers | Other revenues | Gas Utilities            
Segment Reporting Information            
Revenues 801   1,250   1,732 3,658
Intercompany Customers | Electric Utilities            
Segment Reporting Information            
Revenue from contracts with customers 2,929   2,881   5,858 5,760
Intercompany Customers | Gas Utilities            
Segment Reporting Information            
Revenue from contracts with customers 1,319   1,519   2,638 3,039
Intercompany Customers | Other revenues | Electric Utilities            
Segment Reporting Information            
Revenues 0   0   0 0
Intercompany Customers | Other revenues | Gas Utilities            
Segment Reporting Information            
Revenues $ 105   $ 94   $ 217 $ 186