v3.26.1
Segment Reporting - Segment Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Sep. 30, 2025
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Segment Reporting [Line Items]              
Net sales $ 174,580   $ 171,750 $ 342,860 $ 324,210    
Cost of sales (139,240)   (133,800) (270,650) (253,430)    
Selling, general and administrative expenses (24,500)   (30,540) (54,490) (61,510)    
Segment adjusted operating profit 19,410   21,250 36,820 37,340    
Operating profit (loss) 10,860   7,390 17,750 14,540    
Interest expense (4,120)   (4,550) (9,360) (9,070)    
Other income, net 11,330 [1]   270 12,220 [2] 230    
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 18,070   3,110 20,610 5,700    
Net gain (loss) on dispositions of assets 20   (20) 30 5,270    
Payments to Acquire Productive Assets 6,460   12,120 13,130 29,980    
Depreciation, Depletion and Amortization 9,940   9,630 19,570 18,860    
Assets 2,245,650     2,245,650   $ 1,485,080  
Cash and cash equivalents 1,242,480     1,242,480   30,020  
Outside basis difference on held for sale assets           53,900  
Interest and Other Income 10,900     12,900      
Continuing Operations [Member]              
Segment Reporting [Line Items]              
Segment Reporting, Long-Lived Asset, Expenditure for Addition       12,140 22,570    
Assets 2,245,650     2,245,650   1,041,630  
Asbestos [Member]              
Segment Reporting [Line Items]              
Asbestos-related costs           8,000  
Loss Contingency, Receivable 33,810   0 33,810 0 34,700 $ 0
Arrow Engine              
Segment Reporting [Line Items]              
Net gain (loss) on dispositions of assets   $ 100     5,300    
Packaging [Member]              
Segment Reporting [Line Items]              
Net sales 142,920   143,010 282,090 270,580    
Cost of sales (109,350)   (107,460) (215,860) (203,570)    
Selling, general and administrative expenses (14,870)   (15,540) (32,970) (29,750)    
Segment Reporting, Other Segment Item, Amount [3] 20   (20) 10 (30)    
Segment adjusted operating profit 18,720   19,990 33,270 37,230    
Payments to Acquire Productive Assets 4,980   8,110        
Segment Reporting, Long-Lived Asset, Expenditure for Addition       8,740 16,090    
Depreciation, Depletion and Amortization 9,010   8,710 17,800 17,040    
Assets 879,930     879,930   855,080  
Corporate Segment              
Segment Reporting [Line Items]              
Operating profit (loss) (8,550) [4]   (13,860) [5] (19,070) [6] (22,800) [7]    
Realignment and severance costs     (2,200) (1,400) (7,000)    
System implementation costs (700)   (1,400) (1,800) (2,400)    
Mergers, acquisitions, diligence and transaction costs (900)     (900) (300)    
Payments to Acquire Productive Assets 230   1,210        
Segment Reporting, Long-Lived Asset, Expenditure for Addition       720 2,620    
Depreciation, Depletion and Amortization 110   90 220 170    
Assets 1,280,370     1,280,370   112,660  
Cash and cash equivalents 1,212,900     1,212,900      
Specialty Products [Member]              
Segment Reporting [Line Items]              
Net sales 31,660   28,740 60,770 53,630    
Cost of sales (29,890)   (26,340) (54,790) (49,860)    
Selling, general and administrative expenses (1,080)   (1,140) (2,450) (3,660)    
Segment Reporting, Other Segment Item, Amount [3] 0   0 20 0    
Segment adjusted operating profit 690   1,260 3,550 110    
Payments to Acquire Productive Assets 1,250   2,800        
Segment Reporting, Long-Lived Asset, Expenditure for Addition       2,680 3,860    
Depreciation, Depletion and Amortization 820   $ 830 1,550 $ 1,650    
Assets $ 85,350     $ 85,350   $ 73,890  
[1] Includes $10.9 million of interest income on the invested cash proceeds from the sale of Aerospace.
[2] Includes $12.9 million of interest income on the invested cash proceeds from the sale of Aerospace.
[3] Other segment items for each reportable segment includes net gain (loss) on dispositions of assets.
[4] Includes $0.9 million of mergers, acquisition, diligence and transaction costs and $0.7 million of system implementation costs.
[5] Includes $2.2 million of realignment, severance and consulting costs and $1.4 million of system implementation costs.
[6] Includes $1.8 million of system implementation costs, $1.4 million of realignment and severance costs, and $0.9 million of mergers, acquisition, diligence and transaction costs.
[7] Includes $7.0 million of realignment, severance and consulting costs, $5.3 million gain on the sale of Arrow Engine, $2.4 million of system implementation costs and $0.3 million of mergers, acquisition, diligence and transaction costs