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Summary of Significant Accounting Policies (Details 6) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income for the period | $ 30,068 us-gaap_NetIncomeLoss |  | $ 25,357 us-gaap_NetIncomeLoss |  | $ 20,452 us-gaap_NetIncomeLoss |  | $ 28,366 us-gaap_NetIncomeLoss |  | $ 34,287 us-gaap_NetIncomeLoss |  | $ 23,599 us-gaap_NetIncomeLoss |  | $ 25,995 us-gaap_NetIncomeLoss |  | $ 27,012 us-gaap_NetIncomeLoss |  | $ 31,826 us-gaap_NetIncomeLoss |  | $ 32,266 us-gaap_NetIncomeLoss |  | $ 13,103 us-gaap_NetIncomeLoss |  | $ 26,671 us-gaap_NetIncomeLoss |  | $ 104,243 us-gaap_NetIncomeLoss | $ 110,893 us-gaap_NetIncomeLoss | $ 103,866 us-gaap_NetIncomeLoss
Weighted average number of common shares during the period (in thousands) | 41,748 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 41,514 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 41,432 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 41,180 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 40,818 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 40,001 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 39,768 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 39,527 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 39,339 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 39,381 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 39,544 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 39,794 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 41,646,281 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 40,376,562 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 39,513,540 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net income per share - basic | $ 0.72 us-gaap_EarningsPerShareBasic |  | $ 0.61 us-gaap_EarningsPerShareBasic |  | $ 0.49 us-gaap_EarningsPerShareBasic |  | $ 0.69 us-gaap_EarningsPerShareBasic |  | $ 0.84 us-gaap_EarningsPerShareBasic |  | $ 0.59 us-gaap_EarningsPerShareBasic |  | $ 0.65 us-gaap_EarningsPerShareBasic |  | $ 0.68 us-gaap_EarningsPerShareBasic |  | $ 0.81 us-gaap_EarningsPerShareBasic |  | $ 0.82 us-gaap_EarningsPerShareBasic |  | $ 0.33 us-gaap_EarningsPerShareBasic |  | $ 0.67 us-gaap_EarningsPerShareBasic |  | $ 2.50 us-gaap_EarningsPerShareBasic | $ 2.75 us-gaap_EarningsPerShareBasic | $ 2.63 us-gaap_EarningsPerShareBasic
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income for the period | $ 30,068 us-gaap_NetIncomeLoss |  | $ 25,357 us-gaap_NetIncomeLoss |  | $ 20,452 us-gaap_NetIncomeLoss |  | $ 28,366 us-gaap_NetIncomeLoss |  | $ 34,287 us-gaap_NetIncomeLoss |  | $ 23,599 us-gaap_NetIncomeLoss |  | $ 25,995 us-gaap_NetIncomeLoss |  | $ 27,012 us-gaap_NetIncomeLoss |  | $ 31,826 us-gaap_NetIncomeLoss |  | $ 32,266 us-gaap_NetIncomeLoss |  | $ 13,103 us-gaap_NetIncomeLoss |  | $ 26,671 us-gaap_NetIncomeLoss |  | $ 104,243 us-gaap_NetIncomeLoss | $ 110,893 us-gaap_NetIncomeLoss | $ 103,866 us-gaap_NetIncomeLoss
Weighted average number of common shares during the period (in thousands) | 41,748 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 41,514 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 41,432 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 41,180 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 40,818 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 40,001 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 39,768 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 39,527 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 39,339 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 39,381 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 39,544 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 39,794 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | [1] | 41,646,281 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 40,376,562 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 39,513,540 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average number of common equivalent shares to reflect the dilutive effect of common stock equivalent securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 137,000 hmn_IncrementalCommonSharesAttributableToStockOptions | 211,000 hmn_IncrementalCommonSharesAttributableToStockOptions | 222,000 hmn_IncrementalCommonSharesAttributableToStockOptions
Common stock units related to deferred compensation for Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 hmn_IncrementalCommonSharesAttributableToCommonStockUnitsRelatedToDeferredCompensationForDirectors | 0 hmn_IncrementalCommonSharesAttributableToCommonStockUnitsRelatedToDeferredCompensationForDirectors | 112,000 hmn_IncrementalCommonSharesAttributableToCommonStockUnitsRelatedToDeferredCompensationForDirectors
Common stock units related to deferred compensation for employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70,000 hmn_IncrementalCommonSharesAttributableToCommonStockUnitsRelatedToDeferredCompensationForEmployees | 112,000 hmn_IncrementalCommonSharesAttributableToCommonStockUnitsRelatedToDeferredCompensationForEmployees | 116,000 hmn_IncrementalCommonSharesAttributableToCommonStockUnitsRelatedToDeferredCompensationForEmployees
Restricted common stock units related to incentive compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 378,000 hmn_IncrementalCommonSharesAttributableToRestrictedCommonStockUnitsRelatedToIncentiveCompensation | 933,000 hmn_IncrementalCommonSharesAttributableToRestrictedCommonStockUnitsRelatedToIncentiveCompensation | 1,424,000 hmn_IncrementalCommonSharesAttributableToRestrictedCommonStockUnitsRelatedToIncentiveCompensation
Total common and common equivalent shares adjusted to calculate diluted earnings per share (in thousands) | 42,362 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1] | 42,319 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1] | 42,310 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1] | 42,259 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1] | 42,205 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1] | 41,732 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1] | 41,395 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1] | 41,088 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1] | 41,272 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1] | 41,138 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1] | 41,304 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1] | 41,546 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | [1] | 42,230,559 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 41,633,240 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 41,388,368 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per share - diluted | $ 0.71 us-gaap_EarningsPerShareDiluted |  | $ 0.60 us-gaap_EarningsPerShareDiluted |  | $ 0.48 us-gaap_EarningsPerShareDiluted |  | $ 0.67 us-gaap_EarningsPerShareDiluted |  | $ 0.81 us-gaap_EarningsPerShareDiluted |  | $ 0.57 us-gaap_EarningsPerShareDiluted |  | $ 0.63 us-gaap_EarningsPerShareDiluted |  | $ 0.66 us-gaap_EarningsPerShareDiluted |  | $ 0.77 us-gaap_EarningsPerShareDiluted |  | $ 0.78 us-gaap_EarningsPerShareDiluted |  | $ 0.32 us-gaap_EarningsPerShareDiluted |  | $ 0.64 us-gaap_EarningsPerShareDiluted |  | $ 2.47 us-gaap_EarningsPerShareDiluted | $ 2.66 us-gaap_EarningsPerShareDiluted | $ 2.51 us-gaap_EarningsPerShareDiluted
[1] | Rounded to thousands.

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