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Stock Compensation Plans (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 1 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Feb. 01, 2014 | Apr. 01, 2014 | Sep. 02, 2014 | Jul. 31, 2013 | Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units outstanding value | $ 13,000,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding |  |  |  |  |  |
Share price (in dollars per share) | $ 12.67 us-gaap_SharePrice |  |  |  |  |  |
Share-based compensation | 3,220,000 us-gaap_ShareBasedCompensation | 2,155,000 us-gaap_ShareBasedCompensation |  |  |  |  |
Stock bonus plan shares authorized | 86,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized |  |  |  |  |  | 250,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units outstanding | 1,042,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |
RSU available for future issuance | 1,257,900 hnrg_RSUAvailableForFutureIssuance / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |
Restricted stock units expected to vest or lapse within twelve months | 407,000 hnrg_RestrictedStockUnitsExpectedToVestOrLapseWithinTwelveMonths / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |
Units vested in the period | 310,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 315,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |
Value of units vested in the period | 3,100,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 2,300,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |
Expected share based compensation expense | $ 3,300,000 hnrg_ShareBasedCompensatinExpensesExpectedInNextTwelveMonths / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Three Year Vesting Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units vesting period | 3 years |  |  |  |  |  |
February 1, 2014 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share price (in dollars per share) |  |  | 7.66 us-gaap_SharePrice / us-gaap_AwardDateAxis = hnrg_FebruaryFirstTwoThousandFourteenMember |  |  |  |
February 1, 2014 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units granted |  |  | 920,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardDateAxis = hnrg_FebruaryFirstTwoThousandFourteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
February 1, 2014 [Member] | Restricted Stock Units (RSUs) [Member] | Two Year Vesting Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units granted |  |  | 200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardDateAxis = hnrg_FebruaryFirstTwoThousandFourteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = hnrg_TwoYearVestingPeriodMember |  |  |  |
Units vesting period |  |  | 2 years |  |  |  |
February 1, 2014 [Member] | Restricted Stock Units (RSUs) [Member] | Four Year Vesting Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units granted |  |  | 720,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardDateAxis = hnrg_FebruaryFirstTwoThousandFourteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = hnrg_FourYearVestingPeriodMember |  |  |  |
Units vesting period |  |  | 4 years |  |  |  |
April 1, 2014 [Member] | Three Year Vesting Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share price (in dollars per share) |  |  |  | 8.54 us-gaap_SharePrice / us-gaap_AwardDateAxis = hnrg_AprilFirstTwoThousandFourteenMember / us-gaap_VestingAxis = hnrg_ThreeYearVestingPeriodMember |  |  |
April 1, 2014 [Member] | Restricted Stock Units (RSUs) [Member] | Three Year Vesting Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units granted |  |  |  | 171,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardDateAxis = hnrg_AprilFirstTwoThousandFourteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = hnrg_ThreeYearVestingPeriodMember |  |  |
September 2, 2014 [Member] | Three Year Vesting Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share price (in dollars per share) |  |  |  |  | 13.56 us-gaap_SharePrice / us-gaap_AwardDateAxis = hnrg_SeptemberSecondTwoThousandFourteenMember / us-gaap_VestingAxis = hnrg_ThreeYearVestingPeriodMember |  |
September 2, 2014 [Member] | Restricted Stock Units (RSUs) [Member] | Three Year Vesting Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units granted |  |  |  |  | 99,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardDateAxis = hnrg_SeptemberSecondTwoThousandFourteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = hnrg_ThreeYearVestingPeriodMember |  |
Three Other Occasions in 2014 [Member] | Restricted Stock Units (RSUs) [Member] | Three Year Vesting Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units granted | 5,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardDateAxis = hnrg_ThreeOtherOccasionsInTwoThousandFourteenMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = hnrg_ThreeYearVestingPeriodMember |  |  |  |  |  |
July 2014 [Member] | Three Year Vesting Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share price (in dollars per share) |  |  |  |  |  | 8.14 us-gaap_SharePrice / us-gaap_AwardDateAxis = hnrg_July2014Member / us-gaap_VestingAxis = hnrg_ThreeYearVestingPeriodMember |
July 2014 [Member] | Restricted Stock Units (RSUs) [Member] | Three Year Vesting Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Units granted |  |  |  |  |  | 4,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardDateAxis = hnrg_July2014Member / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_VestingAxis = hnrg_ThreeYearVestingPeriodMember |
Units vesting period |  |  |  |  |  | 3 years |
Minimum [Member] | Three Other Occasions in 2014 [Member] | Three Year Vesting Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share price (in dollars per share) | $ 11.39 us-gaap_SharePrice / us-gaap_AwardDateAxis = hnrg_ThreeOtherOccasionsInTwoThousandFourteenMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VestingAxis = hnrg_ThreeYearVestingPeriodMember |  |  |  |  |  |
Maximum [Member] | Three Other Occasions in 2014 [Member] | Three Year Vesting Period [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share price (in dollars per share) | $ 14.06 us-gaap_SharePrice / us-gaap_AwardDateAxis = hnrg_ThreeOtherOccasionsInTwoThousandFourteenMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VestingAxis = hnrg_ThreeYearVestingPeriodMember |  |  |  |  |  |

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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