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SIGNIFICANT ACCOUNTING POLICIES - Invest, VEBA, NP (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
VEBA trust      
Contribution by entity to VEBA trust $ 0 $ 20,000 $ 5,000
Cash and cash equivalents held by VEBA trust $ 138,841 $ 75,915  
Bank loans      
Weighted interest rate (as a percent) 5.70% 6.90%  
Foreign Banks      
VEBA trust      
Cash and cash equivalents held by VEBA trust $ 5,312 $ 4,244  
Trademarks      
Goodwill and indefinite-lived intangible assets:      
Impairments of intangibles $ 0 0 $ 0
Number of basis points increase in discount rate 1.00%    
Number of basis points decrease in royalty rate 1.00%    
Percentage of reduction of fair value due to increase in discount rate 12.00%    
Percentage of increase of fair value due to decrease in discount rate 16.00%    
VEBA Trust | Level 1      
VEBA trust      
Cash and cash equivalents held by VEBA trust $ 13,926 $ 19,126  
Maximum | Spanish Companies      
Loans Payable, Noncurrent [Abstract]      
Debt Instrument, Term 120 days