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Revenue: Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 460,868 $ 378,653 $ 1,752,961 $ 1,377,293
Total revenues 462,612 380,590 1,760,377 1,386,594
Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 7,928 6,968 21,712 20,658
Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 452,940 371,685 1,731,249 1,356,635
Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 1,744 1,937 7,416 9,301
Retail - Electric , Natural Gas and Coal        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 368,692 301,800 1,500,617 1,155,501
Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 40,907 37,541 124,898 116,922
Wholesale        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 13,667 7,247 32,370 24,261
Market - off-system sales        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 16,956 13,586 33,192 25,784
Transmission/Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 20,646 18,479 61,884 54,825
Inter-company Revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers (4,247) (4,398) (12,743) (13,197)
Total revenues (4,345) (4,497) (13,058) (13,482)
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 (4,247) (4,398) (12,743) (13,197)
Inter-company Revenues | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues (98) (99) (315) (285)
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 (99) (110) (298) (329)
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) (4,288) (12,445) (12,868)
Electric Utilities        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 257,845 219,554 664,822 642,268
Total revenues 258,669 220,404 669,586 646,824
Electric Utilities | Services transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 7,928 6,968 21,712 20,658
Electric Utilities | Services transferred over time        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 249,917 212,586 643,110 621,610
Electric Utilities | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 824 850 4,764 4,556
Electric Utilities | Retail - Electric , Natural Gas and Coal        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 211,489 185,892 553,327 554,143
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 13,667 7,247 32,370 24,261
Electric Utilities | Market - off-system sales        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 16,770 13,511 32,590 25,549
Electric Utilities | Transmission/Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 15,919 12,904 46,535 38,315
Gas Utilities        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 207,270 163,497 1,100,882 748,222
Total revenues 208,288 164,683 1,103,849 753,252
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 207,270 163,497 1,100,882 748,222
Gas Utilities | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 1,018 1,186 2,967 5,030
Gas Utilities | Retail - Electric , Natural Gas and Coal        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 157,203 115,908 947,290 601,358
Gas Utilities | Transportation        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers 41,006 37,651 125,196 117,251
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 186 75 602 235
Gas Utilities | Transmission/Other        
Disaggregation of Revenue [Line Items]        
Revenue from contracts with customers $ 8,875 $ 9,863 $ 27,794 $ 29,378