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SIGNIFICANT ACCOUNTING POLICIES - Invest, VEBA, NP (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 29, 2014 USD ($) company | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
VEBA trust |  |  |  |  |
Contribution by entity to VEBA trust |  | $ 0 | $ 0 |  |
Cash and cash equivalents held by VEBA trust |  | 119,145,000 | 126,145,000 | $ 100,108,000 | $ 88,283,000
Goodwill and indefinite-lived intangible assets: |  |  |  |  |
Impairments of intangibles |  | $ 0 | 0 | 0 |
Investment: |  |  |  |  |
Ownership interest in Spanish companies before increase (as a percent) | 50.00% |  |  |  |
Number of foreign companies | company | 2 |  |  |  |
Net loss on step acquisition | $ 529,000 |  |  | $ 529,000 |
Additional income tax provision | $ 2,350,000 |  |  |  |
Ownership interest in Spanish companies after step acquisition (as a percent) |  | 93.00% |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate |  | 2.10% |  |  |
VEBA Trust | Level 1 |  |  |  |  |
VEBA trust |  |  |  |  |
Cash and cash equivalents held by VEBA trust |  | $ 3,027,000 | $ 6,727,000 |  |
Maximum |  |  |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |  |  |
Debt Instrument, Term |  | 2 years |  |  |
Minimum |  |  |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |  |  |
Debt Instrument, Term |  | 1 year |  |  |

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