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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income tax (asset) liability    
Current $ (1,195)hmn_CurrentIncomeTaxAssetsLiabilities $ (1,998)hmn_CurrentIncomeTaxAssetsLiabilities
Deferred $ 261,784hmn_DeferredIncomeTaxAssetsLiabilities $ 163,213hmn_DeferredIncomeTaxAssetsLiabilities