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HOT MADEN INTEREST (Summarized Financial Information in Associate Carrying Amount Rollforward) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of associates [line items] |  |
Currency translation adjustments | $ (15,205) | $ 121
At December 31, 2017 | 177,452 |
Hot Maden Associate [member] |  |
Disclosure of associates [line items] |  |
At January 1, 2017 |  |
Acquisition of Investment in Associate (note 7) | 190,714 |
Company's share of net income (loss) of associate | (28) |
Capital Investment | 584 |
Currency translation adjustments | (13,818) |
At December 31, 2017 | $ 177,452 |

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