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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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Civil Penalties

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No definition available.

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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

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Amount of fees associated with providing collateral for the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

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- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

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-Topic 450
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-Section 50
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