v3.26.1
Debt and Other Obligations - Schedule of Other Short-Term Debt and Obligations (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Mar. 31, 2026
EUR (€)
Dec. 31, 2025
USD ($)
Dec. 31, 2025
EUR (€)
Debt Instrument [Line Items]        
Repurchase Agreement $ 49,400   $ 43,000  
Total of Other Short-term Debt and Obligations 337,900   289,800  
Revolving Credit Facility | Revolving Credit Facility        
Debt Instrument [Line Items]        
Outstanding 103,500   58,800  
Borrowing capacity 402,500 € 350,000,000    
Revolving Credit Facility | Ancillary Credit Facilities        
Debt Instrument [Line Items]        
Borrowing capacity 269,100 € 234,000,000.0 275,000 € 234,000,000.0
Revolving Credit Facility | OEC GmbH outstanding borrowings | Ancillary Credit Facilities        
Debt Instrument [Line Items]        
Outstanding 137,800   127,900  
Revolving Credit Facility | OEC LLC outstanding borrowings | Ancillary Credit Facilities        
Debt Instrument [Line Items]        
Outstanding 12,900   19,400  
Revolving Credit Facility | OEC Huaibei outstanding borrowings | Ancillary Credit Facilities        
Debt Instrument [Line Items]        
Outstanding 0   4,600  
Working Capital Loans | Korea Working Capital Loans (capacity $47.5 million)        
Debt Instrument [Line Items]        
Borrowing capacity 47,500      
Working Capital Loans | Korea Working Capital Loans (capacity $47.5 million) | Uncommitted        
Debt Instrument [Line Items]        
Outstanding 1,600   1,700  
Working Capital Loans | Korea Working Capital Loans (capacity $47.5 million) | Committed        
Debt Instrument [Line Items]        
Outstanding 16,400   17,300  
Working Capital Loans | China Working Capital Loans (capacity $17.6 million) | China Working Capital Loans (capacity $17.6 million)        
Debt Instrument [Line Items]        
Outstanding 16,300   $ 17,100  
Borrowing capacity $ 17,600