v3.26.3
Financial Information by Segment - Schedule of Segment Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
Net sales from external customers $ 472,800 $ 450,900 $ 1,433,200 $ 1,395,000  
Cost of sales 382,000 365,300 1,170,200 1,112,900  
Selling, general and administrative expenses 59,900 57,500 181,700 173,600  
Other segment items 8,100 8,300 25,800 24,600  
Equity in earnings of affiliated companies, net of tax 100 500 400 1,600  
LTIP and other non-operating charges 4,300 3,700 10,000 10,000  
Recovery due to misappropriation of assets, net 0 (7,300) 0 (6,500)  
Goodwill impairment 0 80,800 0 80,800  
Depreciation of property, plant and equipment and amortization of intangible assets and right of use assets 39,600 33,700 105,200 97,200  
Adjusted EBITDA 66,800 57,700 171,100 192,700  
Assets 1,958,300 1,963,900 1,958,300 1,963,900 $ 1,907,600
Capital expenditures 11,800 40,900 73,300 112,300  
Operating segments | Rubber          
Segment Reporting [Line Items]          
Net sales from external customers 306,400 290,900 912,300 916,200  
Cost of sales 250,800 237,900 782,000 739,300  
Selling, general and administrative expenses 35,700 34,100 105,800 104,400  
Other segment items 3,300 4,200 11,300 12,100  
Equity in earnings of affiliated companies, net of tax 100 500 400 1,600  
LTIP and other non-operating charges 1,400 1,800 3,300 4,600  
Recovery due to misappropriation of assets, net   0   0  
Goodwill impairment   32,300   32,300  
Depreciation of property, plant and equipment and amortization of intangible assets and right of use assets 23,300 19,100 62,700 59,200  
Adjusted EBITDA 41,400 36,100 79,600 125,800  
Assets 1,119,100 1,109,900 1,119,100 1,109,900  
Capital expenditures 6,100 15,500 26,500 46,400  
Operating segments | Specialty          
Segment Reporting [Line Items]          
Net sales from external customers 166,400 160,000 520,900 478,800  
Cost of sales 131,200 127,400 388,200 373,600  
Selling, general and administrative expenses 24,000 23,200 75,200 68,400  
Other segment items 3,500 4,100 11,900 12,500  
Equity in earnings of affiliated companies, net of tax 0 0 0 0  
LTIP and other non-operating charges 1,400 1,700 3,400 4,600  
Recovery due to misappropriation of assets, net   0   0  
Goodwill impairment   48,500   48,500  
Depreciation of property, plant and equipment and amortization of intangible assets and right of use assets 16,300 14,600 42,500 38,000  
Adjusted EBITDA 25,400 21,600 91,500 66,900  
Assets 680,100 701,600 680,100 701,600  
Capital expenditures 5,700 25,400 46,800 65,900  
Corporate          
Segment Reporting [Line Items]          
Net sales from external customers 0 0 0 0  
Cost of sales 0 0 0 0  
Selling, general and administrative expenses 200 200 700 800  
Other segment items 1,300 0 2,600 0  
Equity in earnings of affiliated companies, net of tax 0 0 0 0  
LTIP and other non-operating charges 1,500 200 3,300 800  
Recovery due to misappropriation of assets, net   (7,300)   (6,500)  
Goodwill impairment   0   0  
Depreciation of property, plant and equipment and amortization of intangible assets and right of use assets 0 0 0 0  
Adjusted EBITDA 0 0 0 0  
Assets 159,100 152,400 159,100 152,400  
Capital expenditures $ 0 $ 0 $ 0 $ 0