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Debt (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |
Offer and sale of various securities | $ 300,000 hmn_MaximumAmountCoveredUnderUniversalShelfRegistrationForAdditionalCapitalBorrowings |
Current Unsecured Bank Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Unsecured borrowings | 150,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = hmn_CurrentUnsecuredBankCreditFacilityMember |
Expiry date for agreement | Jul. 30, 2019 |
Effective interest rate | 1.32%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = hmn_CurrentUnsecuredBankCreditFacilityMember |
Variable commitment fee unused portion | 0.15%hmn_VariableCommitmentFeeChargeOnUnusedPortionOfCreditFacility / us-gaap_CreditFacilityAxis = hmn_CurrentUnsecuredBankCreditFacilityMember |
Debt Instrument, Basis Spread on Variable Rate | 1.15%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = hmn_CurrentUnsecuredBankCreditFacilityMember |
HMEC's Bank Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Expiry date for agreement | Oct. 06, 2015 |
Senior Notes 2015 [Member] | Senior Note 6.05 % [Member] |  |
Debt Instrument [Line Items] |  |
Unaccrued discount | 11 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = hmn_SeniorNotesTwoZeroOneFiveMember / us-gaap_LongtermDebtTypeAxis = hmn_SeniorNoteSixPointZeroFivePercentMember | 38 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = hmn_SeniorNotesTwoZeroOneFiveMember / us-gaap_LongtermDebtTypeAxis = hmn_SeniorNoteSixPointZeroFivePercentMember
Senior Notes | 6.05%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = hmn_SeniorNotesTwoZeroOneFiveMember / us-gaap_LongtermDebtTypeAxis = hmn_SeniorNoteSixPointZeroFivePercentMember |
Aggregate principal amount | 75,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = hmn_SeniorNotesTwoZeroOneFiveMember / us-gaap_LongtermDebtTypeAxis = hmn_SeniorNoteSixPointZeroFivePercentMember |
Maturity date of Senior note | Jun. 15, 2015 |
Discount on issue | 0.357%hmn_DebtInstrumentPercentageOfDiscountOnIssuance / us-gaap_DebtInstrumentAxis = hmn_SeniorNotesTwoZeroOneFiveMember / us-gaap_LongtermDebtTypeAxis = hmn_SeniorNoteSixPointZeroFivePercentMember |
Effective yield | 6.098%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = hmn_SeniorNotesTwoZeroOneFiveMember / us-gaap_LongtermDebtTypeAxis = hmn_SeniorNoteSixPointZeroFivePercentMember |
Percentage of principal amount of senior notes for redemption | 100.00%hmn_PercentageOfPrincipalAmountOfSeniorNotesForRedemption / us-gaap_DebtInstrumentAxis = hmn_SeniorNotesTwoZeroOneFiveMember / us-gaap_LongtermDebtTypeAxis = hmn_SeniorNoteSixPointZeroFivePercentMember |
Treasury yield basis point | 30 basis points |
Senior Notes 2016 [Member] | Senior Notes 6.85 % [Member] |  |
Debt Instrument [Line Items] |  |
Unaccrued discount | 50 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = hmn_SeniorNotesTwoZeroOneSixMember / us-gaap_LongtermDebtTypeAxis = hmn_SeniorNoteSixPointEightFivePercentMember | 88 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = hmn_SeniorNotesTwoZeroOneSixMember / us-gaap_LongtermDebtTypeAxis = hmn_SeniorNoteSixPointEightFivePercentMember
Senior Notes | 6.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = hmn_SeniorNotesTwoZeroOneSixMember / us-gaap_LongtermDebtTypeAxis = hmn_SeniorNoteSixPointEightFivePercentMember |
Aggregate principal amount | $ 125,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = hmn_SeniorNotesTwoZeroOneSixMember / us-gaap_LongtermDebtTypeAxis = hmn_SeniorNoteSixPointEightFivePercentMember |
Maturity date of Senior note | Apr. 15, 2016 |
Discount on issue | 0.305%hmn_DebtInstrumentPercentageOfDiscountOnIssuance / us-gaap_DebtInstrumentAxis = hmn_SeniorNotesTwoZeroOneSixMember / us-gaap_LongtermDebtTypeAxis = hmn_SeniorNoteSixPointEightFivePercentMember |
Effective yield | 6.893%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = hmn_SeniorNotesTwoZeroOneSixMember / us-gaap_LongtermDebtTypeAxis = hmn_SeniorNoteSixPointEightFivePercentMember |
Percentage of principal amount of senior notes for redemption | 100.00%hmn_PercentageOfPrincipalAmountOfSeniorNotesForRedemption / us-gaap_DebtInstrumentAxis = hmn_SeniorNotesTwoZeroOneSixMember / us-gaap_LongtermDebtTypeAxis = hmn_SeniorNoteSixPointEightFivePercentMember |
Treasury yield basis point | 30 basis points |

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- Definition Maximum amount covered under universal shelf registration for additional capital borrowings. + References No definition available. + Details
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- Definition Percentage of principal amount of senior notes for redemption. + References No definition available. + Details
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- Definition Percentage spread on treasury rate used to calculate redemption price. + References No definition available. + Details
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- Definition Variable commitment fee percentage charged on unused portion of bank credit facility. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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Balance Type: | debit
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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