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SIGNIFICANT ACCOUNTING POLICIES - Invest, VEBA, NP (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
VEBA trust |  |  |  |
Contribution by entity to VEBA trust |  | $ 0 | $ 0 | $ 20,024
Cash and cash equivalents held by VEBA trust | $ 138,960 | $ 138,960 | $ 110,899 |
Bank loans |  |  |  |
Weighted interest rate (as a percent) | 3.00% | 3.00% | 2.00% |
Goodwill and indefinite-lived intangible assets: |  |  |  |
Impairments of intangibles |  | $ 0 | $ 0 | $ 0
Trademarks |  |  |  |
Goodwill and indefinite-lived intangible assets: |  |  |  |
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 | 16.00% |  |  |
Percentage of reduction of fair value due to decrease in royalty rate | 10.00% |  |  |
Potential impairment due to increase in discount rate | $ 2,000 |  |  |
VEBA Trust | Level 1 |  |  |  |
VEBA trust |  |  |  |
Cash and cash equivalents held by VEBA trust | $ 12,085 | $ 12,085 | $ 15,921 |

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