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Business Segment Information: Information Relating to Segment Statement of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting Information                
Revenue from contracts with customers $ 460,868     $ 378,653     $ 1,752,961 $ 1,377,293
Revenues 462,612     380,590     1,760,377 1,386,594
Operating income 79,479     89,873     325,221 295,454
Interest expense, net (40,019)     (38,018)     (117,328) (113,820)
Other income, net 464     1,560     2,731 1,635
Income tax (expense) (2,090)     (5,253)     (15,920) (6,333)
Net income 37,834 $ 35,846 $ 121,024 48,162 $ 28,287 $ 100,487 194,704 176,936
Net income attributable to non-controlling interest (2,861)     (4,050)     (8,790) (11,347)
Net income available for common stock 34,973     44,112     185,914 165,589
Inter-company Revenues                
Segment Reporting Information                
Revenue from contracts with customers (4,247)     (4,398)     (12,743) (13,197)
Revenues (4,345)     (4,497)     (13,058) (13,482)
Consolidation, Eliminations                
Segment Reporting Information                
Revenue from contracts with customers 0     0     0 0
Corporate and Other                
Segment Reporting Information                
Operating income (587)     (224)     (2,552) (3,527)
Electric Utilities                
Segment Reporting Information                
Revenue from contracts with customers 257,845     219,554     664,822 642,268
Revenues 258,669     220,404     669,586 646,824
Operating income 69,483     72,840     165,455 159,645
Gas Utilities                
Segment Reporting Information                
Revenue from contracts with customers 207,270     163,497     1,100,882 748,222
Revenues 208,288     164,683     1,103,849 753,252
Operating income 10,583     17,257     162,318 139,336
Other revenues                
Segment Reporting Information                
Revenues 1,744     1,937     7,416 9,301
Other revenues | Inter-company Revenues                
Segment Reporting Information                
Revenues (98)     (99)     (315) (285)
Other revenues | Consolidation, Eliminations                
Segment Reporting Information                
Revenues 0     0     0 0
Other revenues | Electric Utilities                
Segment Reporting Information                
Revenues 824     850     4,764 4,556
Other revenues | Gas Utilities                
Segment Reporting Information                
Revenues 1,018     1,186     2,967 5,030
External Customers                
Segment Reporting Information                
Revenue from contracts with customers 460,868     378,653     1,752,961 1,377,293
External Customers | Electric Utilities                
Segment Reporting Information                
Revenue from contracts with customers 254,917     216,676     656,036 633,630
External Customers | Gas Utilities                
Segment Reporting Information                
Revenue from contracts with customers 205,951     161,977     1,096,925 743,663
External Customers | Other revenues                
Segment Reporting Information                
Revenues 1,744     1,937     7,416 9,301
External Customers | Other revenues | Electric Utilities                
Segment Reporting Information                
Revenues 824     850     4,764 4,556
External Customers | Other revenues | Gas Utilities                
Segment Reporting Information                
Revenues 920     1,087     2,652 4,745
Intercompany Customers | Electric Utilities                
Segment Reporting Information                
Revenue from contracts with customers 2,928     2,878     8,786 8,638
Intercompany Customers | Gas Utilities                
Segment Reporting Information                
Revenue from contracts with customers 1,319     1,520     3,957 4,559
Intercompany Customers | Other revenues | Electric Utilities                
Segment Reporting Information                
Revenues 0     0     0 0
Intercompany Customers | Other revenues | Gas Utilities                
Segment Reporting Information                
Revenues $ 98     $ 99     $ 315 $ 285