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SIGNIFICANT ACCOUNTING POLICIES - Invest, VEBA, NP (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
VEBA trust |  |  |  |  |
Contribution by entity to VEBA trust | $ 20,024 |  | $ 0 |  |
Cash and cash equivalents held by VEBA trust | 96,314 | $ 96,314 | 119,145 | $ 126,145 | $ 100,108
Goodwill and indefinite-lived intangible assets: |  |  |  |  |
Impairments of intangibles |  | 0 | 0 | $ 0 |
VEBA Trust | Level 1 |  |  |  |  |
VEBA trust |  |  |  |  |
Cash and cash equivalents held by VEBA trust | $ 19,713 | $ 19,713 | $ 3,027 |  |

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