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SHAREHOLDERS' EQUITY (Details) $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 29, 2016 $ / shares | Feb. 12, 2016 USD ($) $ / shares | Oct. 01, 2015 USD ($) shares | Aug. 17, 2015 $ / shares | Jun. 18, 2015 $ / shares | Mar. 11, 2015 USD ($) item shares | Sep. 30, 2016 $ / shares shares | Sep. 30, 2015 shares | Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) shares
Exchangeable shares converted into common stock |  |  |  |  |  |  |  | 4,000,000 | 24,200,000 |  | 4,300,000
Exchangeable, shares outstanding |  |  |  |  |  |  | 0 | 24,200,000 | 0 | 24,200,000 | 24,213,000
Common stock issued |  |  |  |  |  |  | 299,453,000 | 0 | 299,453,000 | 0 | 274,421,000
Weighted average exercise price of stock options (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 2.56 |  |
Exercise of stock options | $ |  |  |  |  |  |  |  |  | $ 3,500 |  |
Proceeds from exercise of stock options (note 8) | $ |  |  |  |  |  |  |  |  | $ 3,500 |  |
Number of mining contractors with which the entity has entered into an agreement | item |  |  |  |  |  | 1 |  |  |  |  |
Semi-annual return of capital payable (in dollars per share) | $ / shares |  | 0.005 |  |  |  |  | 0.005 |  | 0.005 | 0.010 |
Return of capital distribution paid | $ |  | $ 1,500 |  |  |  |  |  |  | $ 2,986 | $ 1,502 |
Fair Value of common stock at issuance | $ |  |  |  |  |  | $ 400 |  |  |  |  |
Share repurchase program | $ |  |  |  |  |  |  |  |  | $ 582 |  | $ 1,800
Number of shares authorized to be repurchased |  |  | 15,000,000 |  |  |  |  |  |  |  |
Period of time over which common stock can be repurchased |  |  | 12 months |  |  |  |  |  |  |  |
Authorized maximum to be spent on repurchases | $ |  |  | $ 15,000 |  |  |  |  |  |  |  |
Share repurchase program (in shares) |  |  |  |  |  |  |  |  | 557,991 |  | 1,896,442
Settlement agreement regarding outstanding litigation |  |  |  |  |  |  |  |  |  |  |
Number of mining contractors with which the entity has entered into an agreement | item |  |  |  |  |  | 1 |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued upon exercise of stock options |  |  |  |  |  |  |  |  | 1,377,000 |  |
Exercise of stock options | $ |  |  |  |  |  |  |  |  | $ 3,500 |  |
Shares issued for settlement of accounts payable (in shares) |  |  |  |  |  | 430,295 |  |  |  |  |
Shares issued for settlement of accounts payable (note 8) (in shares) |  |  |  |  |  |  |  |  |  | 430,000 |
Annual return of capital declared (in dollars per share) | $ / shares |  |  |  |  | $ 0.01 |  |  |  |  |  |
Semi-annual return of capital payable (in dollars per share) | $ / shares | 0.005 |  |  | 0.005 |  |  |  |  |  |  |
Share repurchase program | $ |  |  |  |  |  |  |  |  | $ 582 |  |
Share repurchase program (in shares) |  |  |  |  |  |  |  |  | 558,000 |  |

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