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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