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v2.4.1.9

Employee Benefits (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 employee | Dec. 31, 2013
Employee Benefits [Abstract] |  |
Employer matching contribution, percent of employees' pay | 100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |
Maximum annual contribution per employee, percent | 4.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent |
Participants in employee health plan | 3,063 hnrg_ParticipantsInEmployeeHealthPlan |
Health care cap per person | $ 110,000 hnrg_HealthCareCapPerPerson |
Insured capped maximum exposure health care | 15,000,000 hnrg_InsuredCappedMaximumExposureHealthCare |
Defined contribution plan, cost recognized | 815,000 us-gaap_DefinedContributionPlanCostRecognized | 700,000 us-gaap_DefinedContributionPlanCostRecognized
Health benefits expense | 8,100,000 us-gaap_PolicyholderBenefitsAndClaimsIncurredHealthCare | 4,100,000 us-gaap_PolicyholderBenefitsAndClaimsIncurredHealthCare
Amortized Deferred Bonus Plan | 406,000 hnrg_AmortizedDeferredBonusPlan | 467,000 hnrg_AmortizedDeferredBonusPlan
Production bonus plan expense | 373,000 hnrg_ProductionBonusPlan | 582,000 hnrg_ProductionBonusPlan
Workers' compensation liability | 2,800,000 us-gaap_WorkersCompensationLiabilityCurrentAndNoncurrent | 1,300,000 us-gaap_WorkersCompensationLiabilityCurrentAndNoncurrent
Insured maximum exposure per employee | 1,000,000 hnrg_InsuredMaximumExposurePerEmployee |
Aggragate insurance deductable for employees | $ 4,000,000 hnrg_AggragateInsuranceDeductableForEmployees |

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- Definition Total + References No definition available. + Details
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- Definition Annual Maximum Claims paid per participant + References No definition available. + Details
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- Definition Annual total Maximum Exposure for Health Claims + References No definition available. + Details
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- Definition Insured Maximum Exposure Per Employee + References No definition available. + Details
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- Definition Participants in Employee Health Plan + References No definition available. + Details
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- Definition Production Bonus Plan + References No definition available. + Details
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- Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Amount, after effect of policies assumed or ceded, of expense related to provision for policy benefits and costs incurred for health insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 5 -Article 7 + Details
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- Definition Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
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