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Revenue: Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 470,324 $ 368,422 $ 1,292,093 $ 998,640
Total revenues 474,195 372,572 1,297,765 1,006,004
Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 6,671 6,714 13,784 13,690
Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 463,653 361,708 1,278,309 984,950
Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 3,871 4,150 5,672 7,364
Retail - Electric , Natural Gas and Coal        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 398,106 307,816 1,131,925 853,701
Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 34,567 31,540 83,991 79,381
Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 8,428 5,655 18,703 17,014
Market - off-system sales        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 8,844 7,353 16,236 12,198
Transmission/Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 20,379 16,058 41,238 36,346
Inter-company Revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (4,248) (4,400) (8,496) (8,799)
Total revenues (4,353) (4,494) (8,713) (8,985)
Inter-company Revenues | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Inter-company Revenues | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (4,248) (4,400) (8,496) (8,799)
Inter-company Revenues | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues (105) (94) (217) (186)
Inter-company Revenues | Retail - Electric , Natural Gas and Coal        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Inter-company Revenues | Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (100) (109) (199) (219)
Inter-company Revenues | Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Inter-company Revenues | Market - off-system sales        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 0 0 0 0
Inter-company Revenues | Transmission/Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (4,148) (4,291) (8,297) (8,580)
Electric Utilities        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 201,309 188,116 406,977 422,714
Total revenues 204,379 191,016 410,917 426,420
Electric Utilities | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 6,671 6,714 13,784 13,690
Electric Utilities | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 194,638 181,402 393,193 409,024
Electric Utilities | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 3,070 2,900 3,940 3,706
Electric Utilities | Retail - Electric , Natural Gas and Coal        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 169,032 163,971 341,838 368,251
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 8,428 5,655 18,703 17,014
Electric Utilities | Market - off-system sales        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 8,666 7,266 15,820 12,038
Electric Utilities | Transmission/Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 15,183 11,224 30,616 25,411
Gas Utilities        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 273,263 184,706 893,612 584,725
Total revenues 274,169 186,050 895,561 588,569
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 273,263 184,706 893,612 584,725
Gas Utilities | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 906 1,344 1,949 3,844
Gas Utilities | Retail - Electric , Natural Gas and Coal        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 229,074 143,845 790,087 485,450
Gas Utilities | Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 34,667 31,649 84,190 79,600
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 178 87 416 160
Gas Utilities | Transmission/Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 9,344 $ 9,125 $ 18,919 $ 19,515