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Business Segment Information: Information Relating to Segment Statement of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information    
Revenue from contracts with customers $ 821,769 $ 630,217
Revenues 823,570 633,432
Operating income 173,353 138,315
Interest expense, net (38,545) (37,600)
Other income, net 704 266
Income tax expense (14,488) (494)
Net income 121,024 100,487
Net income attributable to non-controlling interest (3,498) (4,171)
Net income available for common stock 117,526 96,316
Inter-company Revenues    
Segment Reporting Information    
Revenue from contracts with customers (4,248) (4,399)
Revenues (4,360) (4,491)
Consolidation, Eliminations    
Segment Reporting Information    
Revenue from contracts with customers 0 0
Corporate and Other    
Segment Reporting Information    
Operating income (933) (3,122)
Electric Utilities    
Segment Reporting Information    
Revenue from contracts with customers 205,668 234,597
Revenues 206,538 235,404
Operating income 50,746 39,343
Gas Utilities    
Segment Reporting Information    
Revenue from contracts with customers 620,349 400,019
Revenues 621,392 402,519
Operating income 123,540 102,094
Other revenues    
Segment Reporting Information    
Revenues 1,801 3,215
Other revenues | Inter-company Revenues    
Segment Reporting Information    
Revenues (112) (92)
Other revenues | Consolidation, Eliminations    
Segment Reporting Information    
Revenues 0 0
Other revenues | Electric Utilities    
Segment Reporting Information    
Revenues 870 807
Other revenues | Gas Utilities    
Segment Reporting Information    
Revenues 1,043 2,500
External Customers    
Segment Reporting Information    
Revenue from contracts with customers 821,769 630,217
External Customers | Electric Utilities    
Segment Reporting Information    
Revenue from contracts with customers 202,739 231,718
External Customers | Gas Utilities    
Segment Reporting Information    
Revenue from contracts with customers 619,030 398,499
External Customers | Other revenues    
Segment Reporting Information    
Revenues 1,801 3,215
External Customers | Other revenues | Electric Utilities    
Segment Reporting Information    
Revenues 870 807
External Customers | Other revenues | Gas Utilities    
Segment Reporting Information    
Revenues 931 2,408
Intercompany Customers | Electric Utilities    
Segment Reporting Information    
Revenue from contracts with customers 2,929 2,879
Intercompany Customers | Gas Utilities    
Segment Reporting Information    
Revenue from contracts with customers 1,319 1,520
Intercompany Customers | Other revenues | Electric Utilities    
Segment Reporting Information    
Revenues 0 0
Intercompany Customers | Other revenues | Gas Utilities    
Segment Reporting Information    
Revenues $ 112 $ 92