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(10) Self Insurance (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 mi
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Self Insurance [Abstract] |
NumberOfMiningUnits | 5
GeorgraphicSpreadOfMiningUnits | 14
MiningEquipmentAtHistoricalCost (in Dollars) | $ 107

X
- Definition Total active underground mining miles. + References No definition available. + Details
Name: | hnrg_GeorgraphicSpreadOfMiningUnits
Namespace Prefix: | hnrg_
Data Type: | num:lengthItemType
Balance Type: | na
Period Type: | instant

X
- Definition Value of underground mining equipment + References No definition available. + Details
Name: | hnrg_MiningEquipmentAtHistoricalCost
Namespace Prefix: | hnrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of underground mining units + References No definition available. + Details
Name: | hnrg_NumberOfMiningUnits
Namespace Prefix: | hnrg_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | hnrg_SelfInsuranceAbstract
Namespace Prefix: | hnrg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration