ASSET IMPAIRMENT CHARGE (Details) (USD $)	3 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended
Sep. 30, 2012	Dec. 31, 2012	Sep. 27, 2013 Pontiki mining complex Central Appalachia	Aug. 23, 2012 Pontiki mining complex Central Appalachia item	Sep. 30, 2012 Pontiki mining complex Central Appalachia
Asset impairment charges
Number of clean coal stacking tubes with belt line failure				2
Asset impairment charge	$ 19,000,000	$ 19,031,000	$ 0		$ 19,000,000
Property plant and equipment, Fair value					$ 16,100,000

Represents the number of clean coal stacking tubes with failure of the belt line between them.

No definition available.

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228

+ Details

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- Details

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- Definition

Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258

+ Details

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