Segment Information - Schedule of Reconciliation to Consolidated Amounts (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Depreciation and Amortization	$ 29,447	$ 26,632	$ 58,822	$ 52,528
Interest Expense	11,720	10,202	23,273	20,052
Income Tax Expense (Benefit)	13,652	20,592	23,737	38,400
Net Income	77,728	86,995	145,827	161,333
Operating Segments
Segment Reporting Information [Line Items]
Interest Expense	11,695	10,089	23,120	19,761
Income Tax Expense (Benefit)	15,173	22,061	26,730	41,263
Net Income	75,780	85,932	145,459	160,402
Operating Segments \| Electric
Segment Reporting Information [Line Items]
Depreciation and Amortization	22,278	20,387	44,655	40,273
Interest Expense	10,822	9,307	21,479	18,261
Income Tax Expense (Benefit)	(4,469)	(1,401)	(8,477)	(225)
Net Income	19,195	18,485	43,903	40,956
Operating Segments \| Manufacturing
Segment Reporting Information [Line Items]
Depreciation and Amortization	5,523	5,087	10,946	9,999
Interest Expense	627	631	1,249	1,202
Income Tax Expense (Benefit)	958	2,135	1,230	3,717
Net Income	3,481	6,835	5,013	12,096
Operating Segments \| Plastics
Segment Reporting Information [Line Items]
Depreciation and Amortization	1,588	1,133	3,135	2,208
Interest Expense	246	151	392	298
Income Tax Expense (Benefit)	18,684	21,327	33,977	37,771
Net Income	53,104	60,612	96,543	107,350
Corporate
Segment Reporting Information [Line Items]
Depreciation and Amortization	58	25	86	48
Interest Expense	25	113	153	291
Income Tax Expense (Benefit)	(1,521)	(1,469)	(2,993)	(2,863)
Net Income	$ 1,948	$ 1,063	$ 368	$ 931