SIGNIFICANT ACCOUNTING POLICIES - Invest, VEBA, NP (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
VEBA trust
Contribution by entity to VEBA trust	$ 20,000	$ 5,000	$ 0
Cash and cash equivalents held by VEBA trust	$ 75,915	$ 53,270
Bank loans
Weighted interest rate (as a percent)	6.90%	3.10%
Goodwill and indefinite-lived intangible assets:
Impairments of intangibles	$ 0	$ 0	$ 0
Foreign Banks
VEBA trust
Cash and cash equivalents held by VEBA trust	$ 4,244	$ 5,191
Trademarks
Goodwill and indefinite-lived intangible assets:
Number of basis points increase in discount rate	1.00%	1.00%
Number of basis points decrease in royalty rate	1.00%	1.00%
Percentage of reduction of fair value due to increase in discount rate	14.00%	14.00%
Percentage of reduction of fair value due to decrease in royalty rate	10.00%	10.00%
VEBA Trust \| Level 1
VEBA trust
Cash and cash equivalents held by VEBA trust	$ 19,126	$ 3,879

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