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Vectren Fuels Acquisition (Schedule of Business Acquisition Pro Forma Information) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Revenues [Abstract] |  |
As reported | $ 233,902 us-gaap_CoalProductsAndServicesRevenue | $ 137,436 us-gaap_CoalProductsAndServicesRevenue
Net income applicable to common shareholders |  |
As reported | 9,844 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Net Income per Share [Abstract] |  |
As reported | $ 0.34 us-gaap_EarningsPerShareBasic | $ 0.78 us-gaap_EarningsPerShareBasic
Vectren Fuels [Member] |  |
Revenues [Abstract] |  |
As reported | 241,171 us-gaap_CoalProductsAndServicesRevenue / us-gaap_BusinessAcquisitionAxis = hnrg_VectrenFuelsMember | 153,870 us-gaap_CoalProductsAndServicesRevenue / us-gaap_BusinessAcquisitionAxis = hnrg_VectrenFuelsMember
Pro forma | 462,000 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = hnrg_VectrenFuelsMember | 447,500 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = hnrg_VectrenFuelsMember
Net income applicable to common shareholders |  |
As reported | 10,219 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_BusinessAcquisitionAxis = hnrg_VectrenFuelsMember | 22,423 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_BusinessAcquisitionAxis = hnrg_VectrenFuelsMember
Pro forma | $ 39,068 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = hnrg_VectrenFuelsMember | $ 46,503 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = hnrg_VectrenFuelsMember
Net Income per Share [Abstract] |  |
As reported | $ 0.34 us-gaap_EarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = hnrg_VectrenFuelsMember | $ 0.78 us-gaap_EarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = hnrg_VectrenFuelsMember
Pro forma | $ 1.36 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = hnrg_VectrenFuelsMember | $ 1.63 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = hnrg_VectrenFuelsMember

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Revenue derived from sale of coal and related products. Also includes rendering of services and selling of products for exploration, development, mining, and processing, as well as supporting activities. + 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(a),(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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