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ACQUISITIONS AND DIVESTITURES - Consideration Transferred (Details) - Alacer Gold Corporation - USD ($) $ / shares in Units, $ in Thousands | Sep. 16, 2020 | Sep. 15, 2020
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Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Total consideration | $ 2,179,647 | $ 2,200,000
Alacer Gold Corporation |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Share price (in dollars per share) |  | $ 7.21
RSU, PSU and DSU consideration |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
RSU, PSU and DSU consideration | 52,363 |
RSUs and RSU Replacement Units |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
RSU, PSU and DSU consideration |  | $ 15,400
Equity interest issuable, number of shares (in shares) |  | 3,570,261
PSUs and PSU Replacement Units |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
RSU, PSU and DSU consideration |  | $ 23,800
Equity interest issuable, number of shares (in shares) |  | 3,463,023
Deferred share units |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
RSU, PSU and DSU consideration |  | $ 13,200
Equity interest issuable, number of shares (in shares) |  | 1,158,071
Common shares |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Equity consideration | $ 2,127,284 |
Equity interest issued or issuable, number of shares (in shares) | 95,699,911 | 95,699,911
Share price (in dollars per share) |  | $ 22.22

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