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(12) Liability Extinguishment (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2013
Schedule Extinguishment Debt Text [Abstract] |  |
Extinguishment of Debt, Amount | $ 4,300 | $ (4,300)

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

X
- Definition Gross amount of debt extinguished. + References No definition available. + Details
Name: | us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration