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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

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-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

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

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Reflects the amount of new advances made to related parties in the form of loan and lease receivables.

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-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (d)

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-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Name Regulation S-X (SX)

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Related Party And Affiliate Transactions (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Asset impairment charges	$ 45,296,000us-gaap_AssetImpairmentCharges	$ 1,667,000us-gaap_AssetImpairmentCharges	$ 0us-gaap_AssetImpairmentCharges	$ 0us-gaap_AssetImpairmentCharges
Wexford Capital LP [Member]
Related Party Transaction [Line Items]
Expenses for legal, consulting, advisory services, health claims, workers' compensation and other expenses	131,000	149,000	213,000
Rhino Eastern LLC [Member]
Related Party Transaction [Line Items]
Expenses for legal, consulting, advisory services, health claims, workers' compensation and other expenses	4,610,000	4,666,000	6,175,000
Loans to joint venture			11,900,000
Loan repayments from joint venture			11,900,000
Red Cliff Project [Member]
Related Party Transaction [Line Items]
Asset impairment charges	22,200,000
Rich Mountain Property [Member]
Related Party Transaction [Line Items]
Asset impairment charges	8,300,000
Rhino Eastern LLC [Member]
Related Party Transaction [Line Items]
Loans to joint venture			11,900,000
Loan repayments from joint venture			11,900,000
Asset impairment charges	$ 5,900,000