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Debt (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Short-term debt:    
Bank Credit Facility $ 38,000us-gaap_ShortTermBankLoansAndNotesPayable $ 38,000us-gaap_ShortTermBankLoansAndNotesPayable
Long-term debt, current and noncurrent:    
Long-term debt 199,955us-gaap_LongTermDebt 199,939us-gaap_LongTermDebt
Total 237,955us-gaap_DebtAndCapitalLeaseObligations [1] 237,939us-gaap_DebtAndCapitalLeaseObligations [1]
Senior Notes 2015 [Member] | Senior Note 6.05 % [Member]    
Long-term debt, current and noncurrent:    
Long-term debt 74,995us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hmn_SeniorNotesTwoZeroOneFiveMember
/ us-gaap_LongtermDebtTypeAxis
= hmn_SeniorNoteSixPointZeroFivePercentMember		 [1] 74,989us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hmn_SeniorNotesTwoZeroOneFiveMember
/ us-gaap_LongtermDebtTypeAxis
= hmn_SeniorNoteSixPointZeroFivePercentMember		 [1]
Senior Notes 2016 [Member] | Senior Note 6.85 % [Member]    
Long-term debt, current and noncurrent:    
Long-term debt $ 124,960us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hmn_SeniorNotesTwoZeroOneSixMember
/ us-gaap_LongtermDebtTypeAxis
= hmn_SeniorNoteSixPointEightFivePercentMember		 [1] $ 124,950us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hmn_SeniorNotesTwoZeroOneSixMember
/ us-gaap_LongtermDebtTypeAxis
= hmn_SeniorNoteSixPointEightFivePercentMember		 [1]
[1] The Company designates debt obligations as “long-term” based on maturity date at issuance.