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Shareholders' Equity and Common Stock Equivalents (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Shareholders Equity and Stock Options (Additional Textual) [Abstract] |  |  |
Weighted average prices of vested and exercisable options |  | $ 15.78 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableWeightedAverageExercisePrice | $ 14.28 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableWeightedAverageExercisePrice
Aggregate intrinsic (in-the-money) values of vested options | $ 3,332 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue |  |
Aggregate intrinsic options outstanding | 7,589 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue |  |
Percentage of December 31, 2011 outstanding shares repurchased during 2012 | 2.30%hmn_PercentageOfOutstandingCommonStockRepurchasedPeriodTwo |  |
Percentage of December 31, 2012 outstanding shares repurchased during 2013 | 0.40%hmn_PercentageOfOutstandingCommonStockRepurchasedPeriodOne |  |
Percentage of December 31, 2013 outstanding shares repurchased during 2014 | 0.50%hmn_PercentageOfOutstandingCommonStockRepurchasedPeriodThree |  |
Aggregate cost of shares repurchased during 2012 | 15,735 hmn_TreasuryStockValueAcquiredCostMethodForPeriodTwo |  |
Aggregate cost of shares repurchased during 2013 | 3,889 hmn_TreasuryStockValueAcquiredCostMethodForPeriodThree |  |
Aggregate cost of shares repurchased during 2014 | 5,411 hmn_TreasuryStockValueAcquiredCostMethodForPeriodFour |  |
Average price per share of shares repurchased during 2012 | $ 17.16 hmn_TreasuryStockAcquiredAverageCostPerShareForPeriodTwo |  |
Average price per share of shares repurchased during 2013 | $ 22.38 hmn_TreasuryStockAcquiredAverageCostPerShareForPeriodFour |  |
Average price per share of shares repurchased during 2014 | $ 28.33 hmn_TreasuryStockAcquiredAverageCostPershareForPeriodFive |  |
Average price per share of shares repurchased under the Dec. 7, 2011 repurchase program, total | $ 18.85 hmn_TreasuryStockAcquiredAverageCostPerShareForPeriodThree |  |
Remaining Common stock authorized for future repurchases | 22,947 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |
Shares held in treasury | 23,308,430 us-gaap_TreasuryStockNumberOfSharesHeld |  |
Preferred stock, shares authorized | 1,000,000 us-gaap_PreferredStockSharesAuthorized | 1,000,000 us-gaap_PreferredStockSharesAuthorized |
Preferred stock, par value | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare |
Grant date intrinsic value | $ 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateIntrinsicValue |  |
Closing stock price per share | $ 33.18 hmn_CommonStockClosingMarketPricePerShare |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 1,200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |
Maximum [Member] |  |  |
Shareholders Equity and Stock Options (Textual) [Abstract] |  |  |
Stock Repurchase Program, Authorized Amount | 50,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Expiration period of options from the date of grant | 10 years |  |
Minimum [Member] |  |  |
Shareholders Equity and Stock Options (Textual) [Abstract] |  |  |
Expiration period of options from the date of grant | 7 years |  |
Restricted Stock Units (RSUs) [Member] | Maximum [Member] |  |  |
Shareholders Equity and Stock Options (Textual) [Abstract] |  |  |
Vested period of grant date | 5 years |  |
Restricted Stock Units (RSUs) [Member] | Minimum [Member] |  |  |
Shareholders Equity and Stock Options (Textual) [Abstract] |  |  |
Vested period of grant date | 1 year |  |
Employee Stock Option [Member] | Minimum [Member] |  |  |
Shareholders Equity and Stock Options (Textual) [Abstract] |  |  |
Vested period of grant date | 4 years |  |
Common Stock [Member] |  |  |
Shareholders Equity and Stock Options (Textual) [Abstract] |  |  |
Stock Repurchase Program, Authorized Amount | $ 50,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares repurchased under the Dec. 7, 2011 repurchase program, total | 1,435,108 hmn_TreasuryStockSharesTotal / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares repurchased during 2012 | 915,895 hmn_TreasuryStockSharesForPeriodTwo / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares repurchased during 2013 | 173,629 hmn_TreasuryStockSharesForPeriodThree / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares repurchased during 2014 | 190,876 hmn_TreasuryStockSharesForPeriodFour / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |

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