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MARKETABLE SECURITIES (Details) - USD ($) $ in Thousands, shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Investment [Line Items] |  |
Investment in marketable securities | $ 23,057 | $ 0
Net proceeds from sale of marketable securities | 63,445 | 68,641
Gain on marketable securities at FVTOCI, net of tax | (37,686) | 25,948
Balance, beginning of year | 114,001 | 148,944
Additions | 22,674 | 5,295
Disposals | (63,445) | (72,132)
Fair value adjustments | (43,688) | 31,894
Balance, end of year | $ 29,542 | $ 114,001
SilverCrest |  |
Investment [Line Items] |  |
Increase (decrease) in number of shares owned (in shares) | 8.2 |
Investment in marketable securities | $ 23,100 |
Losses on disposals of investments | 2,800 |
Gain on marketable securities at FVTOCI, net of tax | $ 4,300 |
Pretium Resources Inc |  |
Investment [Line Items] |  |
Increase (decrease) in number of shares owned (in shares) | (9.0) |
Net proceeds from sale of marketable securities | $ 63,400 |

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