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Unaudited Selected Quarterly Financial Data (Details) (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
Selected quarterly financial data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance premiums written and contract deposits | $ 292,241 hmn_InsurancePremiumsWrittenAndContractCharges |  | $ 322,746 hmn_InsurancePremiumsWrittenAndContractCharges |  | $ 292,393 hmn_InsurancePremiumsWrittenAndContractCharges |  | $ 260,275 hmn_InsurancePremiumsWrittenAndContractCharges |  | $ 275,379 hmn_InsurancePremiumsWrittenAndContractCharges |  | $ 306,033 hmn_InsurancePremiumsWrittenAndContractCharges |  | $ 267,703 hmn_InsurancePremiumsWrittenAndContractCharges |  | $ 245,078 hmn_InsurancePremiumsWrittenAndContractCharges |  | $ 279,479 hmn_InsurancePremiumsWrittenAndContractCharges |  | $ 285,206 hmn_InsurancePremiumsWrittenAndContractCharges |  | $ 260,289 hmn_InsurancePremiumsWrittenAndContractCharges |  | $ 242,753 hmn_InsurancePremiumsWrittenAndContractCharges |  |  |  |
Total revenues | 269,157 us-gaap_Revenues |  | 265,520 us-gaap_Revenues |  | 264,743 us-gaap_Revenues |  | 261,265 us-gaap_Revenues |  | 259,215 us-gaap_Revenues |  | 251,884 us-gaap_Revenues |  | 265,637 us-gaap_Revenues |  | 254,531 us-gaap_Revenues |  | 255,417 us-gaap_Revenues |  | 256,548 us-gaap_Revenues |  | 254,226 us-gaap_Revenues |  | 244,623 us-gaap_Revenues |  | 1,060,685 us-gaap_Revenues | 1,031,267 us-gaap_Revenues | 1,010,814 us-gaap_Revenues
Net income | $ 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
Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 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
Shares of common stock - weighted average | 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
Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 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
Shares of common stock and equivalent shares - weighted average (1) | 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
[1] | Rounded to thousands.

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