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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income tax (asset) liability
Current	$ 4,575	$ (5,857)
Deferred	$ 286,726	$ 204,421

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- Definition

Current income tax assets liabilities.

+ References

No definition available.

+ Details

Name:	hmn_CurrentIncomeTaxAssetsLiabilities
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

Name:	hmn_DeferredIncomeTaxAssetsLiabilities
Namespace Prefix:	hmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	hmn_IncomeTaxAssetLiabilityAbstract
Namespace Prefix:	hmn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration