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Revenue: Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Revenue from contracts with customers	$ 912,055	$ 821,769
Revenue	921,159	823,570
Retail - Electric , Natural Gas and Coal
Revenue from contracts with customers	810,448	733,819
Transportation
Revenue from contracts with customers	52,728	49,424
Wholesale
Revenue from contracts with customers	9,398	10,275
Market - off-system sales
Revenue from contracts with customers	16,405	7,392
Transmission/Other
Revenue from contracts with customers	23,076	20,859
Other revenues
Revenue	9,104	1,801
Services transferred at a point in time
Revenue from contracts with customers	8,657	7,113
Services transferred over time
Revenue from contracts with customers	903,398	814,656
Electric Utilities
Revenue from contracts with customers	217,829	205,668
Revenue	218,709	206,538
Electric Utilities | Retail - Electric , Natural Gas and Coal
Revenue from contracts with customers	174,903	172,806
Electric Utilities | Transportation
Revenue from contracts with customers	0	0
Electric Utilities | Wholesale
Revenue from contracts with customers	9,398	10,275
Electric Utilities | Market - off-system sales
Revenue from contracts with customers	16,124	7,154
Electric Utilities | Transmission/Other
Revenue from contracts with customers	17,404	15,433
Electric Utilities | Other revenues
Revenue	880	870
Electric Utilities | Services transferred at a point in time
Revenue from contracts with customers	8,657	7,113
Electric Utilities | Services transferred over time
Revenue from contracts with customers	209,172	198,555
Gas Utilities
Revenue from contracts with customers	698,692	620,349
Revenue	706,916	621,392
Gas Utilities | Retail - Electric , Natural Gas and Coal
Revenue from contracts with customers	635,545	561,013
Gas Utilities | Transportation
Revenue from contracts with customers	52,843	49,523
Gas Utilities | Wholesale
Revenue from contracts with customers	0	0
Gas Utilities | Market - off-system sales
Revenue from contracts with customers	281	238
Gas Utilities | Transmission/Other
Revenue from contracts with customers	10,023	9,575
Gas Utilities | Other revenues
Revenue	8,224	1,043
Gas Utilities | Services transferred at a point in time
Revenue from contracts with customers	0	0
Gas Utilities | Services transferred over time
Revenue from contracts with customers	698,692	620,349
Intercompany Eliminations
Revenue from contracts with customers	(4,466)	(4,248)
Revenue	(4,466)	(4,360)
Intercompany Eliminations | Retail - Electric , Natural Gas and Coal
Revenue from contracts with customers	0	0
Intercompany Eliminations | Transportation
Revenue from contracts with customers	(115)	(99)
Intercompany Eliminations | Wholesale
Revenue from contracts with customers	0	0
Intercompany Eliminations | Market - off-system sales
Revenue from contracts with customers	0	0
Intercompany Eliminations | Transmission/Other
Revenue from contracts with customers	(4,351)	(4,149)
Intercompany Eliminations | Other revenues
Revenue	0	(112)
Intercompany Eliminations | Services transferred at a point in time
Revenue from contracts with customers	0	0
Intercompany Eliminations | Services transferred over time
Revenue from contracts with customers	$ (4,466)	$ (4,248)

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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