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Business Segment Information: Information Relating to Segments Statement of Income (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information
Revenue from contracts with customers			$ 1,680,804	$ 1,726,392	$ 1,748,542
Revenue			1,696,941	1,734,900	1,754,268
Fuel, purchased power and cost of natural gas sold			492,404	570,829	625,610
Operations and maintenance, including taxes			551,777	548,909	535,293
Depreciation, depletion and amortization			224,457	209,120	196,328
Operating income			428,303	406,042	397,037
Interest expense			(143,470)	(137,659)	(139,975)
Impairment of investment	$ (20,000)	$ (6,900)	(6,859)	(19,741)	0
Other income (expense), net			(2,293)	(5,740)	(1,180)
Income tax benefit (expense)			(32,918)	(29,580)	23,667
Income from continuing operations			242,763	213,322	279,549
(Loss) from discontinued operations, net of tax			0	0	(6,887)
Net income			242,763	213,322	272,662
Net income attributable to noncontrolling interest			(15,155)	(14,012)	(14,220)
Net income available for common stock			227,608	199,310	258,442
Electric Utilities
Segment Reporting Information
Revenue from contracts with customers			711,843	707,561	709,024
Revenue			714,044	712,752	711,451
Fuel, purchased power and cost of natural gas sold			267,045	268,297	283,840
Operations and maintenance, including taxes			196,794	195,581	186,175
Depreciation, depletion and amortization			94,150	88,577	85,567
Adjusted operating income (loss)			156,055	160,297	155,869
Gas Utilities
Segment Reporting Information
Revenue from contracts with customers			964,421	1,009,646	1,024,352
Revenue			974,670	1,010,030	1,025,307
Fuel, purchased power and cost of natural gas sold			354,645	425,898	462,153
Operations and maintenance, including taxes			303,577	301,844	291,481
Depreciation, depletion and amortization			100,559	92,317	86,434
Adjusted operating income (loss)			215,889	189,971	185,239
Power Generation
Segment Reporting Information
Revenue from contracts with customers			103,258	99,157	90,791
Revenue			105,047	101,258	92,451
Fuel, purchased power and cost of natural gas sold			8,993	9,059	8,592
Operations and maintenance, including taxes			33,695	28,429	25,135
Depreciation, depletion and amortization			20,247	18,991	16,110
Adjusted operating income (loss)			42,112	44,779	42,614
Net income attributable to noncontrolling interest			(15,000)	(14,000)	(14,000)
Mining
Segment Reporting Information
Revenue from contracts with customers			58,567	59,233	65,803
Revenue			61,075	61,629	68,033
Fuel, purchased power and cost of natural gas sold			0	0	0
Operations and maintenance, including taxes			39,033	40,032	43,728
Depreciation, depletion and amortization			9,235	8,970	7,965
Adjusted operating income (loss)			12,807	12,627	16,340
Intercompany Eliminations
Segment Reporting Information
Revenue from contracts with customers			(157,285)	(149,205)	(141,428)
Revenue			(157,895)	(150,769)	(142,974)
Fuel, purchased power and cost of natural gas sold			(138,362)	(132,693)	(129,019)
Operations and maintenance, including taxes			(305,823)	(303,776)	(336,142)
Depreciation, depletion and amortization			(24,884)	(21,800)	(20,909)
Adjusted operating income (loss)			(41,969)	(36,705)	(36,827)
Corporate, Non-Segment
Segment Reporting Information
Revenue			353,143	344,205	379,923
Fuel, purchased power and cost of natural gas sold			83	268	44
Operations and maintenance, including taxes			284,501	286,799	324,916
Depreciation, depletion and amortization			25,150	22,065	21,161
Adjusted operating income (loss)			43,409	35,073	33,802
Other revenues
Segment Reporting Information
Revenue			16,137	8,508	5,726
Other revenues | Electric Utilities
Segment Reporting Information
Revenue			2,201	5,191	2,427
Other revenues | Gas Utilities
Segment Reporting Information
Revenue			10,249	384	955
Other revenues | Power Generation
Segment Reporting Information
Revenue			1,789	2,101	1,660
Other revenues | Mining
Segment Reporting Information
Revenue			2,508	2,396	2,230
Other revenues | Intercompany Eliminations
Segment Reporting Information
Revenue			(610)	(1,564)	(1,546)
External Customers
Segment Reporting Information
Revenue from contracts with customers			1,680,804	1,726,392	1,748,542
Revenue			1,696,941	1,734,900	1,754,268
External Customers | Electric Utilities
Segment Reporting Information
Revenue from contracts with customers			687,929	684,445	686,272
Revenue			690,130	689,636	688,699
External Customers | Gas Utilities
Segment Reporting Information
Revenue from contracts with customers			959,696	1,007,187	1,022,828
Revenue			969,658	1,007,571	1,023,783
External Customers | Power Generation
Segment Reporting Information
Revenue from contracts with customers			6,090	7,580	5,833
Revenue			7,656	9,439	7,246
External Customers | Mining
Segment Reporting Information
Revenue from contracts with customers			27,089	27,180	33,609
Revenue			29,497	28,254	34,540
External Customers | Other revenues
Segment Reporting Information
Revenue			16,137	8,508	5,726
External Customers | Other revenues | Electric Utilities
Segment Reporting Information
Revenue			2,201	5,191	2,427
External Customers | Other revenues | Gas Utilities
Segment Reporting Information
Revenue			9,962	384	955
External Customers | Other revenues | Power Generation
Segment Reporting Information
Revenue			1,566	1,859	1,413
External Customers | Other revenues | Mining
Segment Reporting Information
Revenue			2,408	1,074	931
Intercompany Customers
Segment Reporting Information
Revenue from contracts with customers			0	0	0
Revenue			0	0	0
Intercompany Customers | Electric Utilities
Segment Reporting Information
Revenue from contracts with customers			23,914	23,116	22,752
Revenue			23,914	23,116	22,752
Intercompany Customers | Gas Utilities
Segment Reporting Information
Revenue from contracts with customers			4,724	2,459	1,524
Revenue			5,012	2,459	1,524
Intercompany Customers | Power Generation
Segment Reporting Information
Revenue from contracts with customers			97,169	91,577	84,959
Revenue			97,391	91,819	85,205
Intercompany Customers | Mining
Segment Reporting Information
Revenue from contracts with customers			31,478	32,053	32,194
Revenue			31,578	33,375	33,493
Intercompany Customers | Intercompany Eliminations
Segment Reporting Information
Revenue from contracts with customers			(157,452)	(149,435)	(141,577)
Revenue			(511,038)	(494,974)	(522,897)
Intercompany Customers | Corporate, Non-Segment
Segment Reporting Information
Revenue from contracts with customers			167	230	148
Revenue			353,143	344,205	379,923
Intercompany Customers | Other revenues
Segment Reporting Information
Revenue			0	0	0
Intercompany Customers | Other revenues | Electric Utilities
Segment Reporting Information
Revenue			0	0	0
Intercompany Customers | Other revenues | Gas Utilities
Segment Reporting Information
Revenue			288	0	0
Intercompany Customers | Other revenues | Power Generation
Segment Reporting Information
Revenue			222	242	246
Intercompany Customers | Other revenues | Mining
Segment Reporting Information
Revenue			100	1,322	1,299
Intercompany Customers | Other revenues | Intercompany Eliminations
Segment Reporting Information
Revenue			(353,586)	(345,539)	(381,320)
Intercompany Customers | Other revenues | Corporate, Non-Segment
Segment Reporting Information
Revenue			$ 352,976	$ 343,975	$ 379,775

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