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Consolidated Statement of Stockholders' Equity (USD $) Share data in Thousands | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 285,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 86,576,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 75,118,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 30,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | [1] | $ 162,009,000 us-gaap_StockholdersEquity |
Balance (in Shares) at Dec. 31, 2012 | 28,529 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Adjustment - see Note 1 |  |  | (483,000)us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (483,000)us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount |
Stock-based compensation |  | 2,155,000 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 2,155,000 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation |
Stock-based compensation (in Shares) | 13 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Stock issued on vesting of RSUs | 2,000 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | 2,000 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures |
Stock issued on vesting of RSUs (in Shares) | 316 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Taxes paid on vesting of RSUs |  | (780,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (780,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense |
Taxes paid on vesting of RSUs (in Shares) | (107)hnrg_RestrictedSharesPaidForTaxWithholdings / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Dividends |  |  | (3,476,000)us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (3,476,000)us-gaap_Dividends |
Net income |  |  | 22,423,000 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 22,423,000 us-gaap_NetIncomeLoss | [2]
Other |  | (79,000)us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 349,000 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | [1] | 270,000 us-gaap_StockIssuedDuringPeriodValueOther |
Balance at Dec. 31, 2013 | 287,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 87,872,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 93,582,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 379,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | [1] | 182,120,000 us-gaap_StockholdersEquity |
Balance (in Shares) at Dec. 31, 2013 | 28,751 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Stock-based compensation |  | 3,220,000 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 3,220,000 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation |
Stock-based compensation (in Shares) | 7 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Stock issued on vesting of RSUs | 2,000 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | 2,000 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures |
Stock issued on vesting of RSUs (in Shares) | 310 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Taxes paid on vesting of RSUs |  | (1,067,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | (1,067,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense |
Taxes paid on vesting of RSUs (in Shares) | (106)hnrg_RestrictedSharesPaidForTaxWithholdings / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Dividends |  |  | (4,798,000)us-gaap_Dividends / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (4,798,000)us-gaap_Dividends |
Net income |  |  | 10,219,000 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 10,219,000 us-gaap_NetIncomeLoss | [2]
Other |  | 193,000 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (14,000)us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | [1] | 179,000 us-gaap_StockIssuedDuringPeriodValueOther |
Balance at Dec. 31, 2014 | $ 289,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 90,218,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 99,003,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 365,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | [1] | $ 189,875,000 us-gaap_StockholdersEquity |
Balance (in Shares) at Dec. 31, 2014 | 28,962 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
[1] | Accumulated Other Comprehensive Income
[2] | There is no material difference between net income and comprehensive income.

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