Debt	3 Months Ended
Mar. 31, 2017
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Debt Notes Payable - Homebuilding The Credit Facility provides for an aggregate commitment amount of $400 million, including a $125 million sub-facility for letters of credit. The Credit Facility expires on October 20, 2018. For the quarter ended March 31, 2017, interest on amounts borrowed under the Credit Facility was payable at either the Alternate Base Rate plus a margin of 150 basis points, or at the Eurodollar Rate plus a margin of 250 basis points. These interest rates are subject to adjustment in subsequent periods based on the Company's leverage ratio. The Credit Facility also contains certain financial covenants. At March 31, 2017, the Company was in compliance with all financial covenants of the Credit Facility. The available amount under the Credit Facility is computed in accordance with a borrowing base , which is calculated by applying various advance rates for different categories of inventory, and totaled $588.4 million of availability for additional senior debt at March 31, 2017. As a result, the full $400 million commitment amount of the Credit Facility was available, less any borrowings and letters of credit outstanding. At March 31, 2017, there were $110.9 million of borrowings outstanding and $33.3 million of letters of credit outstanding, leaving net remaining borrowing availability of $255.8 million. The Company’s obligations under the Credit Facility are guaranteed by all of the Company’s subsidiaries, with the exception of subsidiaries that are primarily engaged in the business of mortgage financing, title insurance or similar financial businesses relating to the homebuilding and home sales business, certain subsidiaries that are not 100%-owned by the Company or another subsidiary, and other subsidiaries designated by the Company as Unrestricted Subsidiaries (as defined in Note 11), subject to limitations on the aggregate amount invested in such Unrestricted Subsidiaries in accordance with the terms of the Credit Facility and the indenture for the Company’s $300.0 million aggregate principal amount of 6.75% Senior Notes due 2021 (the “2021 Senior Notes”). The guarantors for the Credit Facility (the “Guarantor Subsidiaries”) are the same subsidiaries that guarantee the 2021 Senior Notes, the Company’s $57.5 million aggregate principal amount of 3.25% Convertible Senior Subordinated Notes due 2017 (the “2017 Convertible Senior Subordinated Notes”) and the Company’s $86.3 million aggregate principal amount of 3.0% Convertible Senior Subordinated Notes due 2018 (the “2018 Convertible Senior Subordinated Notes”). The Company’s obligations under the Credit Facility are general, unsecured senior obligations of the Company and the Guarantor Subsidiaries and rank equally in right of payment with all our and the Guarantor Subsidiaries’ existing and future unsecured senior indebtedness. Our obligations under the Credit Facility are effectively subordinated to our and the Guarantor Subsidiaries’ existing and future secured indebtedness with respect to any assets comprising security or collateral for such indebtedness. As of March 31, 2017, the Company was party to a secured credit agreement for the issuance of letters of credit (the “Letter of Credit Facility”), with a maturity date of September 30, 2017, which allows for the issuance of letters of credit up to a total of $2.0 million. At both March 31, 2017 and December 31, 2016, there was $0.6 million of outstanding letters of credit in aggregate under the Company’s Letter of Credit Facility, which were collateralized with $0.6 million of the Company’s cash. Notes Payable — Financial Services The MIF Mortgage Warehousing Agreement is used to finance eligible residential mortgage loans originated by M/I Financial. The Agreement provides a maximum borrowing availability of $125 million. The MIF Mortgage Warehousing Agreement expires on June 23, 2017. In December 2016, the MIF Mortgage Warehousing Agreement was amended to include a “seasonal increase” provision which increased the maximum borrowing availability to $150 million through February 1, 2017. Interest on amounts borrowed under the MIF Mortgage Warehousing Agreement is payable at a per annum rate equal to the greater of (1) the floating LIBOR rate plus 250 basis points and (2) 2.75%. The MIF Mortgage Warehousing Agreement also contains certain financial covenants. At March 31, 2017, M/I Financial was in compliance with all financial covenants of the MIF Mortgage Warehousing Agreement. M/I Financial expects to enter into an amendment to the MIF Mortgage Warehousing Agreement prior to its expiration that would extend its term for an additional year, but M/I Financial can provide no assurances that it will be able to obtain such an extension. The MIF Mortgage Repurchase Facility is used to finance eligible residential mortgage loans originated by M/I Financial and is structured as a mortgage repurchase facility with a maximum borrowing availability of $15 million. The MIF Mortgage Repurchase Facility expires on October 30, 2017. In December 2016, the MIF Mortgage Repurchase Facility was amended to include a “seasonal increase” provision which increased the maximum borrowing availability to $35 million through February 1, 2017. M/I Financial pays interest on each advance under the MIF Mortgage Repurchase Facility at a per annum rate equal to the floating LIBOR rate plus 250 or 275 basis points depending on the loan type. The MIF Mortgage Repurchase Facility also contains certain financial covenants. At March 31, 2017, M/I Financial was in compliance with all financial covenants of the MIF Mortgage Repurchase Facility. At March 31, 2017, M/I Financial’s total combined maximum borrowing availability under the two credit facilities was $140.0 million, a decrease from $185.0 million at December 31, 2016 due to the expiration of the seasonal increases on the two credit facilities as described in further detail above. At March 31, 2017 and December 31, 2016, M/I Financial had $106.9 million and $152.9 million outstanding on a combined basis under its credit facilities, respectively. Senior Notes As of both March 31, 2017 and December 31, 2016, we had $300.0 million of our 2021 Senior Notes outstanding. The 2021 Senior Notes bear interest at a rate of 6.75% per year, payable semiannually in arrears on January 15 and July 15 of each year, and mature on January 15, 2021. The 2021 Senior Notes are general, unsecured senior obligations of the Company and the Guarantor Subsidiaries and rank equally in right of payment with all our and the Guarantor Subsidiaries’ existing and future unsecured senior indebtedness. The 2021 Senior Notes are effectively subordinated to our and the Guarantor Subsidiaries’ existing and future secured indebtedness with respect to any assets comprising security or collateral for such indebtedness. The 2021 Senior Notes contain certain covenants, as more fully described and defined in the indenture governing the 2021 Senior Notes, which limit the ability of the Company and the restricted subsidiaries to, among other things: incur additional indebtedness; make certain payments, including dividends, or repurchase any shares, in an aggregate amount exceeding our “restricted payments basket”; make certain investments; and create or incur certain liens, consolidate or merge with or into other companies, or liquidate or sell or transfer all or substantially all of our assets. These covenants are subject to a number of exceptions and qualifications as described in the indenture governing the 2021 Senior Notes. As of March 31, 2017, the Company was in compliance with all terms, conditions, and covenants under the indenture. The 2021 Senior Notes are fully and unconditionally guaranteed jointly and severally on a senior unsecured basis by the Guarantor Subsidiaries. The Company may redeem all or any portion of the 2021 Senior Notes on or after January 15, 2018 at a stated redemption price, together with accrued and unpaid interest thereon. The redemption price will initially be 103.375% of the principal amount outstanding, but will decline to 101.688% of the principal amount outstanding if redeemed during the 12-month period beginning on January 15, 2019, and will further decline to 100.000% of the principal amount outstanding if redeemed on or after January 15, 2020, but prior to maturity. The indenture governing our 2021 Senior Notes limits our ability to pay dividends on, and repurchase, our common shares and our 9.75% Series A Preferred Shares (the “Series A Preferred Shares”) to the amount of the positive balance in our “restricted payments basket,” as defined in the indenture. The “restricted payments basket” is equal to $125.0 million plus (1) 50% of our aggregate consolidated net income (or minus 100% of our aggregate consolidated net loss) from October 1, 2015, excluding income or loss from Unrestricted Subsidiaries, plus (2) 100% of the net cash proceeds from either contributions to the common equity of the Company after December 31, 2016 or the sale of qualified equity interests, plus other items and subject to other exceptions. The restricted payments basket was $149.5 million and $144.9 million at March 31, 2017 and December 31, 2016, respectively. The determination to pay future dividends on, or make future repurchases of, our common shares or Series A Preferred Shares will be at the discretion of our board of directors and will depend upon our results of operations, financial condition, capital requirements and compliance with debt covenants and the terms of our Series A Preferred Shares, and other factors deemed relevant by our board of directors. Convertible Senior Subordinated Notes As of both March 31, 2017 and December 31, 2016, we had $86.3 million of our 2018 Convertible Senior Subordinated Notes outstanding. The 2018 Convertible Senior Subordinated Notes bear interest at a rate of 3.0% per year, payable semiannually in arrears on March 1 and September 1 of each year. The 2018 Convertible Senior Subordinated Notes mature on March 1, 2018. At any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their 2018 Convertible Senior Subordinated Notes into the Company’s common shares. The conversion rate initially equals 30.9478 shares per $1,000 of principal amount. This corresponds to an initial conversion price of approximately $32.31 per common share, which equates to approximately 2.7 million common shares. The conversion rate is subject to adjustment upon the occurrence of certain events. The 2018 Convertible Senior Subordinated Notes are fully and unconditionally guaranteed jointly and severally on a senior subordinated unsecured basis by the Guarantor Subsidiaries. The 2018 Convertible Senior Subordinated Notes are senior subordinated unsecured obligations of the Company and the Guarantor Subsidiaries, are subordinated in right of payment to our and the Guarantor Subsidiaries’ existing and future senior indebtedness and are also effectively subordinated to our and the Guarantor Subsidiaries’ existing and future secured indebtedness with respect to any assets comprising security or collateral for such indebtedness. The indenture governing the 2018 Convertible Senior Subordinated Notes requires the Company to repurchase the notes (subject to certain exceptions), at a holder’s option, upon the occurrence of a fundamental change (as defined in the indenture). The Company may redeem for cash any or all of the 2018 Convertible Senior Subordinated Notes (except for any 2018 Convertible Senior Subordinated Notes that the Company is required to repurchase in connection with a fundamental change), but only if the last reported sale price of the Company’s common shares exceeds 130% of the applicable conversion price for the notes on each of at least 20 applicable trading days. The 20 trading days do not need to be consecutive, but must occur during a period of 30 consecutive trading days that ends within 10 trading days immediately prior to the date the Company provides the notice of redemption. The redemption price for the 2018 Convertible Senior Subordinated Notes to be redeemed will equal 100% of the principal amount, plus accrued and unpaid interest, if any. As of both March 31, 2017 and December 31, 2016, we had $57.5 million of our 2017 Convertible Senior Subordinated Notes outstanding. The 2017 Convertible Senior Subordinated Notes bear interest at a rate of 3.25% per year, payable semiannually in arrears on March 15 and September 15 of each year. The 2017 Convertible Senior Subordinated Notes mature on September 15, 2017. At any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their 2017 Convertible Senior Subordinated Notes into the Company’s common shares. The conversion rate initially equals 42.0159 shares per $1,000 of principal amount. This corresponds to an initial conversion price of approximately $23.80 per common share, which equates to approximately 2.4 million common shares. The conversion rate is subject to adjustment upon the occurrence of certain events. The 2017 Convertible Senior Subordinated Notes are fully and unconditionally guaranteed jointly and severally on a senior subordinated unsecured basis by the Guarantor Subsidiaries. The 2017 Convertible Senior Subordinated Notes are senior subordinated unsecured obligations of the Company and the Guarantor Subsidiaries, are subordinated in right of payment to our and the Guarantor Subsidiaries’ existing and future senior indebtedness and are also effectively subordinated to our and the Guarantor Subsidiaries’ existing and future secured indebtedness with respect to any assets comprising security or collateral for such indebtedness. The indenture governing the 2017 Convertible Senior Subordinated Notes provides that we may not redeem the notes prior to their stated maturity date, but also contains provisions requiring the Company to repurchase the 2017 Convertible Senior Subordinated Notes (subject to certain exceptions), at a holder’s option, upon the occurrence of a fundamental change (as defined in the indenture). Notes Payable - Other The Company had other borrowings, which are reported in Notes Payable - Other in our Unaudited Condensed Consolidated Balance Sheets, totaling $7.0 million and $6.4 million as of March 31, 2017 and December 31, 2016, respectively. The balance includes a mortgage note payable on our office building with a $3.3 million principal balance outstanding at March 31, 2017 (and $3.4 million principal balance outstanding at December 31, 2016), which was subsequently paid off in April 2017. The remaining balance is made up of other notes payable incurred through the normal course of business.

Debt

Notes Payable - Homebuilding

The Credit Facility provides for an aggregate commitment amount of $400 million, including a $125 million sub-facility for letters of credit. The Credit Facility expires on October 20, 2018. For the quarter ended March 31, 2017, interest on amounts borrowed under the Credit Facility was payable at either the Alternate Base Rate plus a margin of 150 basis points, or at the Eurodollar Rate plus a margin of 250 basis points. These interest rates are subject to adjustment in subsequent periods based on the Company's leverage ratio. The Credit Facility also contains certain financial covenants. At March 31, 2017, the Company was in compliance with all financial covenants of the Credit Facility.

The available amount under the Credit Facility is computed in accordance with a borrowing base , which is calculated by applying various advance rates for different categories of inventory, and totaled $588.4 million of availability for additional senior debt at March 31, 2017. As a result, the full $400 million commitment amount of the Credit Facility was available, less any borrowings and letters of credit outstanding. At March 31, 2017, there were $110.9 million of borrowings outstanding and $33.3 million of letters of credit outstanding, leaving net remaining borrowing availability of $255.8 million.

The Company’s obligations under the Credit Facility are guaranteed by all of the Company’s subsidiaries, with the exception of subsidiaries that are primarily engaged in the business of mortgage financing, title insurance or similar financial businesses relating to the homebuilding and home sales business, certain subsidiaries that are not 100%-owned by the Company or another subsidiary, and other subsidiaries designated by the Company as Unrestricted Subsidiaries (as defined in Note 11), subject to limitations on the aggregate amount invested in such Unrestricted Subsidiaries in accordance with the terms of the Credit Facility and the indenture for the Company’s $300.0 million aggregate principal amount of 6.75% Senior Notes due 2021 (the “2021 Senior Notes”). The guarantors for the Credit Facility (the “Guarantor Subsidiaries”) are the same subsidiaries that guarantee the 2021 Senior Notes, the Company’s $57.5 million aggregate principal amount of 3.25% Convertible Senior Subordinated Notes due 2017 (the “2017 Convertible Senior Subordinated Notes”) and the Company’s $86.3 million aggregate principal amount of 3.0% Convertible Senior Subordinated Notes due 2018 (the “2018 Convertible Senior Subordinated Notes”).

The Company’s obligations under the Credit Facility are general, unsecured senior obligations of the Company and the Guarantor Subsidiaries and rank equally in right of payment with all our and the Guarantor Subsidiaries’ existing and future unsecured senior indebtedness. Our obligations under the Credit Facility are effectively subordinated to our and the Guarantor Subsidiaries’ existing and future secured indebtedness with respect to any assets comprising security or collateral for such indebtedness.

As of March 31, 2017, the Company was party to a secured credit agreement for the issuance of letters of credit (the “Letter of Credit Facility”), with a maturity date of September 30, 2017, which allows for the issuance of letters of credit up to a total of $2.0 million. At both March 31, 2017 and December 31, 2016, there was $0.6 million of outstanding letters of credit in aggregate under the Company’s Letter of Credit Facility, which were collateralized with $0.6 million of the Company’s cash.

Notes Payable — Financial Services

The MIF Mortgage Warehousing Agreement is used to finance eligible residential mortgage loans originated by M/I Financial. The Agreement provides a maximum borrowing availability of $125 million. The MIF Mortgage Warehousing Agreement expires on June 23, 2017. In December 2016, the MIF Mortgage Warehousing Agreement was amended to include a “seasonal increase” provision which increased the maximum borrowing availability to $150 million through February 1, 2017. Interest on amounts borrowed under the MIF Mortgage Warehousing Agreement is payable at a per annum rate equal to the greater of (1) the floating LIBOR rate plus 250 basis points and (2) 2.75%. The MIF Mortgage Warehousing Agreement also contains certain financial covenants. At March 31, 2017, M/I Financial was in compliance with all financial covenants of the MIF Mortgage Warehousing Agreement. M/I Financial expects to enter into an amendment to the MIF Mortgage Warehousing Agreement prior to its expiration that would extend its term for an additional year, but M/I Financial can provide no assurances that it will be able to obtain such an extension.

The MIF Mortgage Repurchase Facility is used to finance eligible residential mortgage loans originated by M/I Financial and is structured as a mortgage repurchase facility with a maximum borrowing availability of $15 million. The MIF Mortgage Repurchase Facility expires on October 30, 2017. In December 2016, the MIF Mortgage Repurchase Facility was amended to include a “seasonal increase” provision which increased the maximum borrowing availability to $35 million through February 1, 2017. M/I Financial pays interest on each advance under the MIF Mortgage Repurchase Facility at a per annum rate equal to the floating LIBOR rate plus 250 or 275 basis points depending on the loan type. The MIF Mortgage Repurchase Facility also contains certain financial covenants. At March 31, 2017, M/I Financial was in compliance with all financial covenants of the MIF Mortgage Repurchase Facility.

At March 31, 2017, M/I Financial’s total combined maximum borrowing availability under the two credit facilities was $140.0 million, a decrease from $185.0 million at December 31, 2016 due to the expiration of the seasonal increases on the two credit facilities as described in further detail above. At March 31, 2017 and December 31, 2016, M/I Financial had $106.9 million and $152.9 million outstanding on a combined basis under its credit facilities, respectively.

Senior Notes

As of both March 31, 2017 and December 31, 2016, we had $300.0 million of our 2021 Senior Notes outstanding. The 2021 Senior Notes bear interest at a rate of 6.75% per year, payable semiannually in arrears on January 15 and July 15 of each year, and mature on January 15, 2021. The 2021 Senior Notes are general, unsecured senior obligations of the Company and the Guarantor Subsidiaries and rank equally in right of payment with all our and the Guarantor Subsidiaries’ existing and future unsecured senior indebtedness. The 2021 Senior Notes are effectively subordinated to our and the Guarantor Subsidiaries’ existing and future secured indebtedness with respect to any assets comprising security or collateral for such indebtedness.

The 2021 Senior Notes contain certain covenants, as more fully described and defined in the indenture governing the 2021 Senior Notes, which limit the ability of the Company and the restricted subsidiaries to, among other things: incur additional indebtedness; make certain payments, including dividends, or repurchase any shares, in an aggregate amount exceeding our “restricted payments basket”; make certain investments; and create or incur certain liens, consolidate or merge with or into other companies, or liquidate or sell or transfer all or substantially all of our assets. These covenants are subject to a number of exceptions and qualifications as described in the indenture governing the 2021 Senior Notes. As of March 31, 2017, the Company was in compliance with all terms, conditions, and covenants under the indenture.

The 2021 Senior Notes are fully and unconditionally guaranteed jointly and severally on a senior unsecured basis by the Guarantor Subsidiaries.

The Company may redeem all or any portion of the 2021 Senior Notes on or after January 15, 2018 at a stated redemption price, together with accrued and unpaid interest thereon. The redemption price will initially be 103.375% of the principal amount outstanding, but will decline to 101.688% of the principal amount outstanding if redeemed during the 12-month period beginning on January 15, 2019, and will further decline to 100.000% of the principal amount outstanding if redeemed on or after January 15, 2020, but prior to maturity.

The indenture governing our 2021 Senior Notes limits our ability to pay dividends on, and repurchase, our common shares and our 9.75% Series A Preferred Shares (the “Series A Preferred Shares”) to the amount of the positive balance in our “restricted payments basket,” as defined in the indenture. The “restricted payments basket” is equal to $125.0 million plus (1) 50% of our aggregate consolidated net income (or minus 100% of our aggregate consolidated net loss) from October 1, 2015, excluding income or loss from Unrestricted Subsidiaries, plus (2) 100% of the net cash proceeds from either contributions to the common equity of the Company after December 31, 2016 or the sale of qualified equity interests, plus other items and subject to other exceptions. The restricted payments basket was $149.5 million and $144.9 million at March 31, 2017 and December 31, 2016, respectively. The determination to pay future dividends on, or make future repurchases of, our common shares or Series A Preferred Shares will be at the discretion of our board of directors and will depend upon our results of operations, financial condition, capital requirements and compliance with debt covenants and the terms of our Series A Preferred Shares, and other factors deemed relevant by our board of directors.

Convertible Senior Subordinated Notes

As of both March 31, 2017 and December 31, 2016, we had $86.3 million of our 2018 Convertible Senior Subordinated Notes outstanding. The 2018 Convertible Senior Subordinated Notes bear interest at a rate of 3.0% per year, payable semiannually in arrears on March 1 and September 1 of each year. The 2018 Convertible Senior Subordinated Notes mature on March 1, 2018. At any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their 2018 Convertible Senior Subordinated Notes into the Company’s common shares. The conversion rate initially equals 30.9478 shares per $1,000 of principal amount. This corresponds to an initial conversion price of approximately $32.31 per common share, which equates to approximately 2.7 million common shares. The conversion rate is subject to adjustment upon the occurrence of certain events. The 2018 Convertible Senior Subordinated Notes are fully and unconditionally guaranteed jointly and severally on a senior subordinated unsecured basis by the Guarantor Subsidiaries. The 2018 Convertible Senior Subordinated Notes are senior subordinated unsecured obligations of the Company and the Guarantor Subsidiaries, are subordinated in right of payment to our and the Guarantor Subsidiaries’ existing and future senior indebtedness and are also effectively subordinated to our and the Guarantor Subsidiaries’ existing and future secured indebtedness with respect to any assets comprising security or collateral for such indebtedness. The indenture governing the 2018 Convertible Senior Subordinated Notes requires the Company to repurchase the notes (subject to certain exceptions), at a holder’s option, upon the occurrence of a fundamental change (as defined in the indenture).

The Company may redeem for cash any or all of the 2018 Convertible Senior Subordinated Notes (except for any 2018 Convertible Senior Subordinated Notes that the Company is required to repurchase in connection with a fundamental change), but only if the last reported sale price of the Company’s common shares exceeds 130% of the applicable conversion price for the notes on each of at least 20 applicable trading days. The 20 trading days do not need to be consecutive, but must occur during a period of 30 consecutive trading days that ends within 10 trading days immediately prior to the date the Company provides the notice of redemption. The redemption price for the 2018 Convertible Senior Subordinated Notes to be redeemed will equal 100% of the principal amount, plus accrued and unpaid interest, if any.

As of both March 31, 2017 and December 31, 2016, we had $57.5 million of our 2017 Convertible Senior Subordinated Notes outstanding. The 2017 Convertible Senior Subordinated Notes bear interest at a rate of 3.25% per year, payable semiannually in arrears on March 15 and September 15 of each year. The 2017 Convertible Senior Subordinated Notes mature on September 15, 2017. At any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their 2017 Convertible Senior Subordinated Notes into the Company’s common shares. The conversion rate initially equals 42.0159 shares per $1,000 of principal amount. This corresponds to an initial conversion price of approximately $23.80 per common share, which equates to approximately 2.4 million common shares. The conversion rate is subject to adjustment upon the occurrence of certain events. The 2017 Convertible Senior Subordinated Notes are fully and unconditionally guaranteed jointly and severally on a senior subordinated unsecured basis by the Guarantor Subsidiaries. The 2017 Convertible Senior Subordinated Notes are senior subordinated unsecured obligations of the Company and the Guarantor Subsidiaries, are subordinated in right of payment to our and the Guarantor Subsidiaries’ existing and future senior indebtedness and are also effectively subordinated to our and the Guarantor Subsidiaries’ existing and future secured indebtedness with respect to any assets comprising security or collateral for such indebtedness. The indenture governing the 2017 Convertible Senior Subordinated Notes provides that we may not redeem the notes prior to their stated maturity date, but also contains provisions requiring the Company to repurchase the 2017 Convertible Senior Subordinated Notes (subject to certain exceptions), at a holder’s option, upon the occurrence of a fundamental change (as defined in the indenture).

Notes Payable - Other

The Company had other borrowings, which are reported in Notes Payable - Other in our Unaudited Condensed Consolidated Balance Sheets, totaling $7.0 million and $6.4 million as of March 31, 2017 and December 31, 2016, respectively. The balance includes a mortgage note payable on our office building with a $3.3 million principal balance outstanding at March 31, 2017 (and $3.4 million principal balance outstanding at December 31, 2016), which was subsequently paid off in April 2017. The remaining balance is made up of other notes payable incurred through the normal course of business.