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Other Long-Term Assets and Other Income (Schedule of Other Long-Term Assets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Long-term assets: |  |  |  |
Advance coal royalties | $ 5,496 us-gaap_RoyaltyGuaranteesCommitmentsAmount |  | $ 4,693 us-gaap_RoyaltyGuaranteesCommitmentsAmount |
Deferred financing costs, net | 6,507 us-gaap_DeferredFinanceCostsNoncurrentNet |  | 1,195 us-gaap_DeferredFinanceCostsNoncurrentNet |
Marketable equity securities available for sale, at fair value (restricted) | 2,249 us-gaap_AvailableForSaleSecuritiesCurrent | [1] | 3,889 us-gaap_AvailableForSaleSecuritiesCurrent | [1]
Ohio River Terminal (see Note 9) | 2,653 us-gaap_RealEstateInvestmentPropertyAtCost |  | 2,836 us-gaap_RealEstateInvestmentPropertyAtCost |
Other | 1,944 hnrg_OtherMiscellaneousAssets |  | 2,769 hnrg_OtherMiscellaneousAssets |
Long-term assets | $ 18,849 us-gaap_AssetsNoncurrent |  | $ 15,382 us-gaap_AssetsNoncurrent |
[1] | Held by Sunrise Indemnity, Inc., our wholly-owned captive insurance company.

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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
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- Definition Net amount of long-term deferred finance costs capitalized at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The amount the entity has committed to make for future royalty guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 440 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473578&loc=d3e63223-108013 + Details
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