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Consolidated Statement of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Preferred Shares [Member] | Common Shares [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Shares [Member]
--- | --- | --- | --- | --- | --- | ---
Stockholders' Equity, Beginning Balance at Dec. 31, 2011 | $ 273,350 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 96,325 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 221 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 139,943 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 103,701 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (66,840)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Shares Outstanding, Beginning Balance at Dec. 31, 2011 |  | 4,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 18,736,357 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 13,347 us-gaap_ProfitLoss |  |  |  | 13,347 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Common share issuance - shares |  |  | 2,530,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Net proceeds from issuance of common shares | 42,085 us-gaap_ProceedsFromIssuanceOfCommonStock |  | 25 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 42,060 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Stock options exercised, shares |  |  | 378,674 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Stock options exercised - value | 4,762 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  | (2,759)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 7,521 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Stock-based compensation expense | 1,734 us-gaap_ShareBasedCompensation |  |  | 1,734 us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Deferral of executive and director compensation | 150 mho_DeferralOfExecutiveAndDirectorCompensation |  |  | 150 mho_DeferralOfExecutiveAndDirectorCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Executive and director deferred compensation distributions shares |  |  | 42,222 mho_ExecutiveAndDirectorDeferredCompensationDistributionsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Executive and director deferred compensation distributions | 0 mho_ExecutiveAndDirectorDeferredCompensationDistributions |  |  | (839)mho_ExecutiveAndDirectorDeferredCompensationDistributions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 839 mho_ExecutiveAndDirectorDeferredCompensationDistributions / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Stockholders' Equity, Ending Balance at Dec. 31, 2012 | 335,428 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 96,325 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 246 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 180,289 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 117,048 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (58,480)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Shares Outstanding, Ending Balance at Dec. 31, 2012 |  | 4,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 21,687,253 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 151,423 us-gaap_ProfitLoss |  |  |  | 151,423 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Fair value over carrying value of preferred share redeemed | 0 us-gaap_PreferredStockDividendsAndOtherAdjustments | 2,190 us-gaap_PreferredStockDividendsAndOtherAdjustments / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  | (2,190)us-gaap_PreferredStockDividendsAndOtherAdjustments / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividends paid to preferred shareholders | (3,656)us-gaap_DividendsPreferredStock |  |  |  | (3,656)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Common share issuance - shares |  |  | 2,461,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Net proceeds from issuance of common shares | 54,617 us-gaap_ProceedsFromIssuanceOfCommonStock |  | 25 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 54,592 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Preferred shares redeemed - shares |  | (2,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |
Preferred share redeemed - value | (50,352)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | (50,352)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  |  |  |
Stock options exercised, shares |  |  | 184,832 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Stock options exercised - value | 2,640 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  | (1,031)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 3,671 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Stock-based compensation expense | 2,344 us-gaap_ShareBasedCompensation |  |  | 2,344 us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Deferral of executive and director compensation | 359 mho_DeferralOfExecutiveAndDirectorCompensation |  |  | 359 mho_DeferralOfExecutiveAndDirectorCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Executive and director deferred compensation distributions shares |  |  | 24,858 mho_ExecutiveAndDirectorDeferredCompensationDistributionsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Executive and director deferred compensation distributions | 0 mho_ExecutiveAndDirectorDeferredCompensationDistributions |  |  | (493)mho_ExecutiveAndDirectorDeferredCompensationDistributions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 493 mho_ExecutiveAndDirectorDeferredCompensationDistributions / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Stockholders' Equity, Ending Balance at Dec. 31, 2013 | 492,803 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 48,163 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 271 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 236,060 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 262,625 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (54,316)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Shares Outstanding, Ending Balance at Dec. 31, 2013 |  | 2,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 24,357,943 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 50,789 us-gaap_ProfitLoss |  |  |  | 50,789 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividends paid to preferred shareholders | (4,875)us-gaap_DividendsPreferredStock |  |  |  | (4,875)us-gaap_DividendsPreferredStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Net proceeds from issuance of common shares | 0 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |  |
Stock options exercised, shares | (147,619)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  | 147,619 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Stock options exercised - value | 1,944 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  | (988)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 2,932 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Stock-based compensation expense | 3,215 us-gaap_ShareBasedCompensation |  |  | 3,215 us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Deferral of executive and director compensation | 419 mho_DeferralOfExecutiveAndDirectorCompensation |  |  | 419 mho_DeferralOfExecutiveAndDirectorCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Executive and director deferred compensation distributions shares |  |  | 7,348 mho_ExecutiveAndDirectorDeferredCompensationDistributionsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Executive and director deferred compensation distributions | 0 mho_ExecutiveAndDirectorDeferredCompensationDistributions |  |  | (146)mho_ExecutiveAndDirectorDeferredCompensationDistributions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 146 mho_ExecutiveAndDirectorDeferredCompensationDistributions / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Stockholders' Equity, Ending Balance at Dec. 31, 2014 | $ 544,295 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 48,163 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 271 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 238,560 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 308,539 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (51,238)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Shares Outstanding, Ending Balance at Dec. 31, 2014 |  | 2,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 24,512,910 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |

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