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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2014 | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
Other Commitments [Line Items] |  |  |  |  |
Asset retirement obligation, end of period |  | $ 13,249 | $ 8,573 |  | $ 5,683
White Mesa Mill |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Civil penalties | $ 38 |  |  |  |
Canyon Project |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Loss contingency, estimate of possible loss |  | 21,570 |  | $ 12,980 |
Asset retirement obligation, end of period |  | 41,540 |  | $ 31,850 |
Collateral funded by November 30, 2016 | Canyon Project |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Debt instrument, collateral fee |  | 1,760 |  |  |
Collateral funded by February 28, 2017 | Canyon Project |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Debt instrument, collateral fee |  | $ 1,760 |  |  |

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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