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Revenue: Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 368,423 $ 324,193 $ 998,640 $ 854,402
Total revenues 372,572 326,914 1,006,004 863,964
Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 6,714 6,930 13,690 13,494
Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 361,709 317,263 984,950 840,908
Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 4,149 2,721 7,364 9,562
Retail - Electric , Natural Gas and Coal        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 309,029 269,328 856,110 722,779
Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 31,540 30,654 79,381 74,623
Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 4,442 4,712 14,605 12,119
Market - off-system sales        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 7,353 1,981 12,198 4,347
Transmission/Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 16,059 17,518 36,346 40,534
Inter-company Revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (37,703) (38,542) (77,551) (77,184)
Total revenues (38,188) (38,934) (78,518) (77,967)
Inter-company Revenues | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (7,140) (7,916) (14,247) (15,755)
Inter-company Revenues | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (30,563) (30,626) (63,304) (61,429)
Inter-company Revenues | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues (485) (392) (967) (783)
Inter-company Revenues | Retail - Electric , Natural Gas and Coal        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (7,140) (7,916) (14,247) (15,755)
Inter-company Revenues | Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (109) (138) (219) (277)
Inter-company Revenues | Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (23,480) (24,476) (47,931) (48,088)
Inter-company Revenues | Market - off-system sales        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (1,675) (1,580) (4,559) (4,219)
Inter-company Revenues | Transmission/Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (5,299) (4,432) (10,595) (8,845)
Electric Utilities        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 182,654 161,573 409,925 335,489
Total revenues 184,933 163,200 412,341 337,339
Electric Utilities | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Electric Utilities | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 182,654 161,573 409,925 335,489
Electric Utilities | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 2,279 1,627 2,416 1,850
Electric Utilities | Retail - Electric , Natural Gas and Coal        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 158,470 141,804 356,970 290,444
Electric Utilities | Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Electric Utilities | Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 3,010 3,470 8,932 9,022
Electric Utilities | Market - off-system sales        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 8,941 3,538 16,597 8,405
Electric Utilities | Transmission/Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 12,233 12,761 27,426 27,618
Gas Utilities        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 184,706 160,598 584,725 515,663
Total revenues 186,050 161,110 588,569 521,883
Gas Utilities | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Gas Utilities | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 184,706 160,598 584,725 515,663
Gas Utilities | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 1,344 512 3,844 6,220
Gas Utilities | Retail - Electric , Natural Gas and Coal        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 143,845 120,594 485,450 418,841
Gas Utilities | Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 31,649 30,792 79,600 74,900
Gas Utilities | Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Gas Utilities | Market - off-system sales        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 87 23 160 161
Gas Utilities | Transmission/Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 9,125 9,189 19,515 21,761
Power Generation        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 24,912 25,718 53,604 51,185
Total revenues 25,348 26,122 54,511 52,088
Power Generation | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Power Generation | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 24,912 25,718 53,604 51,185
Power Generation | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 436 404 907 903
Power Generation | Retail - Electric , Natural Gas and Coal        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Power Generation | Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Power Generation | Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 24,912 25,718 53,604 51,185
Power Generation | Market - off-system sales        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Power Generation | Transmission/Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Mining        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 13,854 14,846 27,937 29,249
Total revenues 14,429 15,416 29,101 30,621
Mining | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 13,854 14,846 27,937 29,249
Mining | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Mining | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 575 570 1,164 1,372
Mining | Retail - Electric , Natural Gas and Coal        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 13,854 14,846 27,937 29,249
Mining | Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Mining | Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Mining | Market - off-system sales        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Mining | Transmission/Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 0 $ 0 $ 0 $ 0