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MARKETABLE SECURITIES (Details) - USD ($) $ in Thousands | 2 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 23, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Detailed Information About Marketable Securities [Abstract] |  |  |
Balance, beginning of year | $ 114,001 | $ 148,944 | $ 88,184
Additions |  | 5,295 | 7,329
Additions from the acquisition of Seabee Gold Operation (note 3) |  | 0 | 351
Disposals | $ (24,983) | (72,132) | (5,327)
Fair value adjustments |  | $ 31,894 | $ 58,407

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