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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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