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SIGNIFICANT ACCOUNTING POLICIES: Invest, VEBA, NP (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 USD ($) | Mar. 29, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) company | Dec. 31, 2012 USD ($)
VEBA trust |  |  |  |  |  |  |
Cash and cash equivalents held by VEBA trust | $ 100,108 |  | $ 88,283 | $ 126,145 | $ 100,108 | $ 88,283 | $ 63,862
Goodwill and indefinite-lived intangible assets: |  |  |  |  |  |  |
Impairments of intangibles |  |  |  | $ 0 | 0 | $ 0 |
Equity method investment: |  |  |  |  |  |  |
Ownership interest in Spanish companies before increase (as a percent) |  |  | 50.00% |  |  | 50.00% |
Number of foreign companies that are accounted for using equity method | company |  |  |  |  |  | 2 |
Dividends paid by subsidiary |  |  |  |  |  | $ 0 |
Pre-tax impairment charge |  |  |  |  |  | $ 975 |
Net loss on step acquisition |  | $ 529 |  |  | $ 529 |  |
Additional income tax provision |  | $ 2,350 |  |  |  |  |
Ownership interest in Spanish companies after step acquisition (as a percent) | 83.00% |  |  |  | 83.00% |  |
Total expected payment for additional stock |  |  |  |  | $ 1,400 |  |
Payment for purchase of stock |  |  |  |  | 1,200 |  |
Loans Payable, Noncurrent [Abstract] |  |  |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate |  |  |  | 2.40% |  |  |
VEBA Trust |  |  |  |  |  |  |
VEBA trust |  |  |  |  |  |  |
Contribution by entity to VEBA trust | $ 1,000 |  | $ 15,000 |  |  |  |
VEBA Trust | Level 1 |  |  |  |  |  |  |
VEBA trust |  |  |  |  |  |  |
Cash and cash equivalents held by VEBA trust | $ 10,845 |  |  | $ 6,727 | $ 10,845 |  |
Maximum |  |  |  |  |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 4 years |  |  |
Minimum |  |  |  |  |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 1 year |  |  |

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