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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