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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

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