Segment Information - Schedule of Reconciliation to Consolidated Amounts (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Depreciation and Amortization	$ 30,811	$ 29,447	$ 60,789	$ 58,822
Interest Expense	12,890	11,720	25,526	23,273
Income Tax (Benefit) Expense	(21,157)	13,652	(16,280)	23,737
Net Income (Loss)	(7,607)	77,728	65,003	145,827
Operating Segments
Segment Reporting [Line Items]
Interest Expense	12,906	11,695	25,388	23,120
Income Tax (Benefit) Expense	(21,446)	15,173	(13,760)	26,730
Net Income (Loss)	(6,812)	75,780	65,661	145,459
Operating Segments \| Electric
Segment Reporting [Line Items]
Depreciation and Amortization	24,223	22,278	47,669	44,655
Interest Expense	11,990	10,822	23,726	21,479
Income Tax (Benefit) Expense	(13,104)	(4,469)	(18,286)	(8,477)
Net Income (Loss)	18,698	19,195	53,948	43,903
Operating Segments \| Manufacturing
Segment Reporting [Line Items]
Depreciation and Amortization	4,762	5,523	9,549	10,946
Interest Expense	591	627	1,190	1,249
Income Tax (Benefit) Expense	1,336	958	2,585	1,230
Net Income (Loss)	4,571	3,481	8,854	5,013
Operating Segments \| Plastics
Segment Reporting [Line Items]
Depreciation and Amortization	1,750	1,588	3,422	3,135
Interest Expense	325	246	472	392
Income Tax (Benefit) Expense	(9,678)	18,684	1,941	33,977
Net Income (Loss)	(30,081)	53,104	2,859	96,543
Corporate
Segment Reporting [Line Items]
Depreciation and Amortization	76	58	149	86
Interest Expense	(16)	25	138	153
Income Tax (Benefit) Expense	289	(1,521)	(2,520)	(2,993)
Net Income (Loss)	$ (795)	$ 1,948	$ (658)	$ 368