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Equity Investment in Savoy (Condensed Statement of Operations - Savoy) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Revenue | $ 241,171 us-gaap_Revenues |  | $ 153,870 us-gaap_Revenues |
Expenses | (230,470)us-gaap_CostsAndExpenses |  | (124,272)us-gaap_CostsAndExpenses |
Net income | 10,219 us-gaap_NetIncomeLoss | [1] | 22,423 us-gaap_NetIncomeLoss | [1]
Savoy [Member] |  |  |  |
Revenue | 41,583 us-gaap_Revenues / dei_LegalEntityAxis = hnrg_SavoyMember |  | 42,248 us-gaap_Revenues / dei_LegalEntityAxis = hnrg_SavoyMember |
Expenses | (29,354)us-gaap_CostsAndExpenses / dei_LegalEntityAxis = hnrg_SavoyMember |  | (29,322)us-gaap_CostsAndExpenses / dei_LegalEntityAxis = hnrg_SavoyMember |
Net income | $ 12,229 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = hnrg_SavoyMember |  | $ 12,926 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = hnrg_SavoyMember |
[1] | There is no material difference between net income and comprehensive income.

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- Definition Total costs of sales and operating expenses for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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