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INCOME AND MINING TAXES - Reconciliation of Tax Provision (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
INCOME AND MINING TAXES. |  |  |
(Loss) income before income and mining taxes | $ (26,003) | $ 17,306 | $ (45,010)
Statutory tax rate (as a percent) | 35.00% | 34.00% | 34.00%
US Federal and State tax recovery at statutory rate | $ (9,101) | $ 5,884 | $ (15,303)
Reconciling items: |  |  |
Equity pickup in MSC | (16) | (4,533) | (821)
Impairment of MSC |  |  | 4,004
Deferred foreign income inclusion | 21,002 |  |
Foreign tax credits | (16,628) |  |
Tax rate changes | 28,048 |  |
Revisions to prior year estimates | (573) | (828) | 906
Adjustment for foreign tax rates | 115 | (501) | (1,230)
Other permanent differences | (1,761) | 818 | (15,694)
Unrealized foreign exchange rate (loss)/gain | 2,469 | 5,972 | 9,389
NOL expires and revisions | (2,233) | 586 | 1,215
Valuation allowance | (36,691) | (11,147) | (7,026)
Tax benefit | $ (15,369) | $ (3,749) | $ (24,560)

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