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DEBT AND CREDIT FACILITY - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | May 31, 2016 | Aug. 04, 2015
Investment [Line Items] |  |  |  |
Equity component of convertible notes | $ 68,347,000 | $ 68,347,000 |  |
Repayment of bank loan | 0 | (3,845,000) |  |
SGO Mining Inc. (formerly Claude Resources Inc.) |  |  |  |
Investment [Line Items] |  |  |  |
Borrowings recognised as of acquisition date |  |  | $ 13,707,000 |
Senior Convertible Unsecured Notes |  |  |  |
Investment [Line Items] |  |  |  |
Debt | $ 265,000,000 |  |  |
Debt instrument, interest rate, stated percentage | 2.875% |  |  |
Debt conversion, converted instrument, shares issued | 50 |  |  |
Debt instrument, convertible, conversion price (in usd per share) | $ 20.00 |  |  |
Number of trading days sale price exceeds conversion price | 20 days |  |  |
Number of consecutive trading days | 30 days |  |  |
Debt instrument, convertible, threshold percentage of stock price trigger | 130.00% |  |  |
Debt instrument, redemption price, percentage | 100.00% |  |  |
Debt instrument, fair value disclosure | $ 178,358,000 |  |  |
Debt instrument, term | 7 years |  |  |
Fair value inputs, discount rate | 8.50% |  |  |
Equity component of convertible notes, gross | $ 77,723,000 |  |  |
Equity component of convertible notes | 68,347,000 |  |  |
Revolving Credit Facility |  |  |  |
Investment [Line Items] |  |  |  |
Notional amount |  |  |  | $ 75,000,000
Borrowing capacity, Accordion feature | $ 25,000,000 |  |  |
Line of credit facility, expiration period | 3 years |  |  |
Line of credit facility, financial letters of credit, percentage | 66.00% |  |  |
Line of credit facility, undrawn fees, percentage | 25.00% |  |  |
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |
Investment [Line Items] |  |  |  |
Borrowings, adjustment to interest rate basis | 2.25% |  |  |
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |
Investment [Line Items] |  |  |  |
Borrowings, adjustment to interest rate basis | 3.75% |  |  |
Letter of Credit |  |  |  |
Investment [Line Items] |  |  |  |
Debt | $ 7,700,000 | $ 7,600,000 |  |

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