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Segment - Summary of Information about Reported Segment Revenue, Measures of Segment's Profit or Loss, Significant Segment Expenses and Measure of Segment's Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting [Abstract]                
Net sales $ 155,431     $ 109,217     $ 450,159 $ 387,494
Less:                
Cost of sales excluding depreciation, amortization and turnaround expense 109,453     84,214     321,310 272,596
Depreciation and amortization 19,348     16,664     60,027 52,512
Turnaround expense 1,087     16,284     5,722 20,638
Total cost of sales 129,888     117,162     387,059 345,746
Selling, general and administrative                
Wages and benefits 5,953     5,357     18,210 17,045
Other selling general and administrative 4,380     4,685     12,120 14,838
Total selling general and administrative 10,333     10,042     30,330 31,883
Interest expense 7,363     8,115     23,313 26,229
Loss (gain) on extinguishments of debt 0     0     59 (3,013)
Loss from asset write-down and disposals 434     5,639     3,033 8,582
Income tax provision (benefit) 2,536     (4,482)     3,337 (2,629)
Other segment items (2,238)     (1,877)     (5,453) (9,100)
Net income (loss) 7,115 $ 3,006 $ (1,640) (25,382) $ 9,555 $ 5,623 8,481 (10,204)
Reconciliation of Profit or Loss [Abstract]                
Adjustments and reconciling items $ 0     $ 0     $ 0 $ 0