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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