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Pension Plans and Other Postretirement Benefits (Details 7) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Defined Benefit Plan [Member] |  |
Summary of minimum funding requirement and the expected full year contributions for the Company's plans |  |
Minimum funding requirement for 2015 | $ 0 hmn_DefinedBenefitPlanAndOtherPostRetirementPlanMinimumFundingRequired / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |
Expected contributions (approximations) for the year ended December 31, 2015 as of the time of this Form 10-K | 0 hmn_DefinedBenefitPlanAndOtherPostRetirementPlanExpectedContributionForNextFiscalYearEnd / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | [1]
Supplemental Defined Benefit Plans [Member] |  |
Summary of minimum funding requirement and the expected full year contributions for the Company's plans |  |
Expected contributions (approximations) for the year ended December 31, 2015 as of the time of this Form 10-K | $ 1,320 hmn_DefinedBenefitPlanAndOtherPostRetirementPlanExpectedContributionForNextFiscalYearEnd / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | [1]
[1] | HMEC’s Annual Report on Form 10-K for the year ended December 31, 2014.

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- Definition Defined benefit plan and other post retirement plan expected contributions for the full next fiscal year as of the current fiscal year-end. + References No definition available. + Details
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- Definition Defined benefit plan and other post retirement plan minimum funding required. + References No definition available. + Details
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- Details
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