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Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total Operating Revenues	$ 342,336	$ 337,716	$ 689,404	$ 676,797
Total Operating Revenues from Contracts with Customers	342,398	338,050	689,638	678,342
Electric
Disaggregation of Revenue [Line Items]
Total Operating Revenues	112,828	113,763	254,317	265,671
Electric Segment - ARP Revenues	(62)	(334)	(234)	(1,545)
Manufacturing
Disaggregation of Revenue [Line Items]
Total Operating Revenues	96,684	102,475	196,065	209,257
Plastics
Disaggregation of Revenue [Line Items]
Total Operating Revenues	132,824	121,478	239,022	201,869
Total Retail | Electric
Disaggregation of Revenue [Line Items]
Total Operating Revenues	96,382	93,715	220,871	230,168
Retail: Residential | Electric
Disaggregation of Revenue [Line Items]
Total Operating Revenues	26,369	26,974	65,824	70,951
Retail: Commercial and Industrial | Electric
Disaggregation of Revenue [Line Items]
Total Operating Revenues	68,191	64,989	151,221	155,474
Retail: Other | Electric
Disaggregation of Revenue [Line Items]
Total Operating Revenues	1,822	1,752	3,826	3,743
Transmission | Electric
Disaggregation of Revenue [Line Items]
Total Operating Revenues	12,440	14,829	24,654	26,936
Wholesale | Electric
Disaggregation of Revenue [Line Items]
Total Operating Revenues	1,669	2,670	5,134	4,508
Other | Electric
Disaggregation of Revenue [Line Items]
Total Operating Revenues	2,337	2,549	3,658	4,059
Metal Parts and Tooling | Manufacturing
Disaggregation of Revenue [Line Items]
Total Operating Revenues	88,152	89,396	176,067	179,463
Plastic Products and Tooling | Manufacturing
Disaggregation of Revenue [Line Items]
Total Operating Revenues	6,467	10,068	15,453	24,211
Scrap Metal | Manufacturing
Disaggregation of Revenue [Line Items]
Total Operating Revenues	$ 2,065	$ 3,011	$ 4,545	$ 5,583

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