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Debt (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Short-term debt:    
Bank Credit Facility $ 38,000us-gaap_ShortTermBankLoansAndNotesPayable $ 38,000us-gaap_ShortTermBankLoansAndNotesPayable
Long-term debt, current and noncurrent:    
Final Maturity 2019  
Long-term debt, current and noncurrent 199,939us-gaap_LongTermDebt 199,874us-gaap_LongTermDebt
Total 237,939us-gaap_DebtAndCapitalLeaseObligations [1] 237,874us-gaap_DebtAndCapitalLeaseObligations [1]
Senior Notes 2015 [Member]    
Long-term debt, current and noncurrent:    
Effective Interest Rates 6.10%hmn_DebtInstrumentImputedInterestRate
/ us-gaap_DebtInstrumentAxis
= hmn_SeniorNotesTwoZeroOneFiveMember		 [1]  
Final Maturity 2015 [1]  
Long-term debt, current and noncurrent 74,989us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hmn_SeniorNotesTwoZeroOneFiveMember		 [1] 74,962us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hmn_SeniorNotesTwoZeroOneFiveMember		 [1]
Senior Notes 2016 [Member]    
Long-term debt, current and noncurrent:    
Effective Interest Rates 6.90%hmn_DebtInstrumentImputedInterestRate
/ us-gaap_DebtInstrumentAxis
= hmn_SeniorNotesTwoZeroOneSixMember		 [1]  
Final Maturity 2016 [1]  
Long-term debt, current and noncurrent $ 124,950us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hmn_SeniorNotesTwoZeroOneSixMember		 [1] $ 124,912us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hmn_SeniorNotesTwoZeroOneSixMember		 [1]
[1] The Company designates debt obligations as “long-term” based on maturity date at issuance.