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Vectren Fuels Acquisition (Schedule of Business Acquisition) (Details) (Vectren Fuels [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Assets received: |
Accounts receivable | $ 16,879 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
Advance royalties | 711 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
Prepaid expense | 701 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
Land and mineral rights | 87,293 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
Mine development | 37,485 hnrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedMineDevelopment
Building and equipment | 152,977 hnrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndEquipment
Total assets received | 330,710 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Liabilities assumed: |
Accounts payable and accrued liabilities | 12,707 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
Asset retirement obligations | 6,550 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
Total liabilities assumed | 19,257 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
Total consideration paid | 311,453 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
Coal [Member] |
Assets received: |
Inventory | 21,484 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = hnrg_VectrenFuelsMember / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryCoalMember
Replacement Parts [Member] |
Assets received: |
Inventory | $ 13,180 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = hnrg_VectrenFuelsMember / us-gaap_PublicUtilitiesInventoryAxis = us-gaap_PublicUtilitiesInventoryReplacementPartsMember

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