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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Income tax (asset) liability |  |
Current | $ (1,998) | $ 4,575
Deferred | $ 163,213 | $ 286,726

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- Definition Current income tax assets liabilities. + References No definition available. + Details
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Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Deferred income tax assets liabilities. + References No definition available. + Details
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Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | hmn_
Data Type: | xbrli:stringItemType
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Period Type: | duration