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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, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information              
Revenue from contracts with customers $ 324,193     $ 329,746   $ 854,402 $ 927,716
Revenues (326,914)     (333,888)   (863,964) (931,698)
Operating income 66,933     54,001   220,118 214,132
Interest expense, net (35,545)     (34,264)   (70,998) (68,981)
Impairment of investment 0 $ (6,900) $ (20,000) 0   (6,859) 0
Other Nonoperating Income (Expense) Including Allowance For Funds Used During Construction, Equity (1,863)     263   490 (526)
Income tax (expense) (4,831)     (2,307)   (20,833) (19,570)
Net income 24,694 $ 97,224   17,693 $ 107,362 121,918 125,055
Net income attributable to noncontrolling interest (3,728)     (3,110)   (7,778) (6,664)
Net income available for common stock 20,966     14,583   114,140 118,391
Inter-company Revenues              
Segment Reporting Information              
Revenue from contracts with customers (38,542)     (26,147)   (77,184) (54,347)
Revenues 38,934     35,688   77,967 73,559
Consolidation, Eliminations              
Segment Reporting Information              
Revenue from contracts with customers 0     0   0 0
Corporate              
Segment Reporting Information              
Operating income (29)     102   131 (405)
Electric Utilities              
Segment Reporting Information              
Revenue from contracts with customers 161,573     164,377   335,489 347,050
Revenues (163,200)     (166,354)   (337,339) (349,281)
Operating income 33,993     33,546   69,643 74,566
Gas Utilities              
Segment Reporting Information              
Revenue from contracts with customers 160,598     164,026   515,663 576,225
Revenues (161,110)     (165,469)   (521,883) (576,549)
Operating income 18,209     8,557   121,106 111,871
Power Generation              
Segment Reporting Information              
Revenue from contracts with customers 25,718     15,062   51,185 30,531
Revenues (26,122)     (24,708)   (52,088) (49,953)
Operating income 11,402     10,156   22,751 22,123
Mining              
Segment Reporting Information              
Revenue from contracts with customers 14,846     12,428   29,249 28,257
Revenues (15,416)     (13,045)   (30,621) (29,474)
Operating income 3,358     1,640   6,487 5,977
Other Revenues              
Segment Reporting Information              
Revenues (2,721)     (4,142)   (9,562) (3,982)
Other Revenues | Inter-company Revenues              
Segment Reporting Information              
Revenues 392     9,541   783 19,212
Other Revenues | Consolidation, Eliminations              
Segment Reporting Information              
Revenues 0     0   0 0
Other Revenues | Electric Utilities              
Segment Reporting Information              
Revenues (1,627)     (1,977)   (1,850) (2,231)
Other Revenues | Gas Utilities              
Segment Reporting Information              
Revenues (512)     (1,443)   (6,220) (324)
Other Revenues | Power Generation              
Segment Reporting Information              
Revenues (404)     (9,646)   (903) (19,422)
Other Revenues | Mining              
Segment Reporting Information              
Revenues (570)     (617)   (1,372) (1,217)
External Operating Revenue              
Segment Reporting Information              
Revenue from contracts with customers 324,193     329,746   854,402 927,716
External Operating Revenue | Electric Utilities              
Segment Reporting Information              
Revenue from contracts with customers 156,197     159,140   323,700 335,803
External Operating Revenue | Gas Utilities              
Segment Reporting Information              
Revenue from contracts with customers 159,824     163,303   514,111 574,803
External Operating Revenue | Power Generation              
Segment Reporting Information              
Revenue from contracts with customers 1,242     1,765   3,097 4,022
External Operating Revenue | Mining              
Segment Reporting Information              
Revenue from contracts with customers 6,930     5,538   13,494 13,088
External Operating Revenue | Other Revenues              
Segment Reporting Information              
Revenues (2,721)     (4,142)   (9,562) (3,982)
External Operating Revenue | Other Revenues | Electric Utilities              
Segment Reporting Information              
Revenues (1,627)     (1,977)   (1,850) (2,231)
External Operating Revenue | Other Revenues | Gas Utilities              
Segment Reporting Information              
Revenues (512)     (1,443)   (6,220) (324)
External Operating Revenue | Other Revenues | Power Generation              
Segment Reporting Information              
Revenues (349)     (434)   (792) (870)
External Operating Revenue | Other Revenues | Mining              
Segment Reporting Information              
Revenues (233)     (288)   (700) (557)
Inter-company Operating Revenue | Electric Utilities              
Segment Reporting Information              
Revenue from contracts with customers 5,376     5,237   11,789 11,247
Inter-company Operating Revenue | Gas Utilities              
Segment Reporting Information              
Revenue from contracts with customers 774     723   1,552 1,422
Inter-company Operating Revenue | Power Generation              
Segment Reporting Information              
Revenue from contracts with customers 24,476     13,297   48,088 26,509
Inter-company Operating Revenue | Mining              
Segment Reporting Information              
Revenue from contracts with customers 7,916     6,890   15,755 15,169
Inter-company Operating Revenue | Other Revenues | Electric Utilities              
Segment Reporting Information              
Revenues 0     0   0 0
Inter-company Operating Revenue | Other Revenues | Gas Utilities              
Segment Reporting Information              
Revenues 0     0   0 0
Inter-company Operating Revenue | Other Revenues | Power Generation              
Segment Reporting Information              
Revenues (55)     (9,212)   (111) (18,552)
Inter-company Operating Revenue | Other Revenues | Mining              
Segment Reporting Information              
Revenues $ (337)     $ (329)   $ (672) $ (660)