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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, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information                
Revenue from contracts with customers $ 378,653     $ 344,312     $ 1,377,293 $ 1,198,714
Revenues 380,590     346,590     1,386,594 1,210,554
Operating income 89,873     82,234     295,454 302,352
Interest expense, net (38,018)     (36,041)     (113,820) (107,039)
Impairment of investment 0     0     0 (6,859)
Other income (expense), net 1,560     (1,193)     1,635 (703)
Income tax (expense) (5,253)     (4,651)     (6,333) (25,484)
Net income 48,162 $ 28,287 $ 100,487 40,349 $ 24,694 $ 97,224 176,936 162,267
Net income attributable to non-controlling interest (4,050)     (4,066)     (11,347) (11,844)
Net income available for common stock 44,112     36,283     165,589 150,423
Inter-company Revenues                
Segment Reporting Information                
Revenue from contracts with customers (39,616)     (39,899)     (117,167) (117,083)
Revenues (40,104)     (39,935)     (118,622) (117,902)
Consolidation, Eliminations                
Segment Reporting Information                
Revenue from contracts with customers 0     0     0 0
Corporate                
Segment Reporting Information                
Operating income (223)     (239)     (3,526) (108)
Electric Utilities                
Segment Reporting Information                
Revenue from contracts with customers 212,900     200,618     622,825 536,107
Revenues 213,103     200,842     625,444 538,181
Operating income 57,608     52,083     114,989 121,726
Gas Utilities                
Segment Reporting Information                
Revenue from contracts with customers 163,497     142,876     748,222 658,539
Revenues 164,683     143,929     753,252 665,812
Operating income 17,257     18,147     139,336 139,253
Power Generation                
Segment Reporting Information                
Revenue from contracts with customers 26,058     26,049     79,662 77,234
Revenues 26,520     26,518     81,031 78,606
Operating income 10,323     8,738     32,842 31,489
Mining                
Segment Reporting Information                
Revenue from contracts with customers 15,814     14,668     43,751 43,917
Revenues 16,388     15,236     45,489 45,857
Operating income 4,908     3,505     11,813 9,992
Other revenues                
Segment Reporting Information                
Revenues 1,937     2,278     9,301 11,840
Other revenues | Inter-company Revenues                
Segment Reporting Information                
Revenues (488)     (36)     (1,455) (819)
Other revenues | Consolidation, Eliminations                
Segment Reporting Information                
Revenues 0     0     0 0
Other revenues | Electric Utilities                
Segment Reporting Information                
Revenues 203     224     2,619 2,074
Other revenues | Gas Utilities                
Segment Reporting Information                
Revenues 1,186     1,053     5,030 7,273
Other revenues | Power Generation                
Segment Reporting Information                
Revenues 462     469     1,369 1,372
Other revenues | Mining                
Segment Reporting Information                
Revenues 574     568     1,738 1,940
External Customers                
Segment Reporting Information                
Revenue from contracts with customers 378,653     344,312     1,377,293 1,198,714
External Customers | Electric Utilities                
Segment Reporting Information                
Revenue from contracts with customers 207,374     194,941     604,966 518,641
External Customers | Gas Utilities                
Segment Reporting Information                
Revenue from contracts with customers 161,977     141,275     743,663 655,386
External Customers | Power Generation                
Segment Reporting Information                
Revenue from contracts with customers 2,333     1,528     8,006 4,625
External Customers | Mining                
Segment Reporting Information                
Revenue from contracts with customers 6,969     6,568     20,658 20,062
External Customers | Other revenues                
Segment Reporting Information                
Revenues 1,937     2,278     9,301 11,840
External Customers | Other revenues | Electric Utilities                
Segment Reporting Information                
Revenues 203     224     2,619 2,074
External Customers | Other revenues | Gas Utilities                
Segment Reporting Information                
Revenues 1,087     863     4,745 7,083
External Customers | Other revenues | Power Generation                
Segment Reporting Information                
Revenues 412     414     1,219 1,206
External Customers | Other revenues | Mining                
Segment Reporting Information                
Revenues 235     777     718 1,477
Intercompany Customers | Electric Utilities                
Segment Reporting Information                
Revenue from contracts with customers 5,526     5,677     17,859 17,466
Intercompany Customers | Gas Utilities                
Segment Reporting Information                
Revenue from contracts with customers 1,520     1,601     4,559 3,153
Intercompany Customers | Power Generation                
Segment Reporting Information                
Revenue from contracts with customers 23,725     24,521     71,656 72,609
Intercompany Customers | Mining                
Segment Reporting Information                
Revenue from contracts with customers 8,845     8,100     23,093 23,855
Intercompany Customers | Other revenues | Electric Utilities                
Segment Reporting Information                
Revenues 0     0     0 0
Intercompany Customers | Other revenues | Gas Utilities                
Segment Reporting Information                
Revenues 99     190     285 190
Intercompany Customers | Other revenues | Power Generation                
Segment Reporting Information                
Revenues 50     55     150 166
Intercompany Customers | Other revenues | Mining                
Segment Reporting Information                
Revenues $ 339     $ (209)     $ 1,020 $ 463