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Fair Value Measurements Fair Value of Financial Instrument Assumptions (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Fair Value of Financial Instrument Assumptions [Line Items] |  |
Letters of Credit Potential Commitments, Amount | $ 26.9 | $ 25.8
Warehousing Agreement - First Amendment to Amended and Restated [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
Maximum Borrowing Capacity under MIF Warehousing Line | 110.0 |
Repurchase Agreement [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
Maximum Borrowing Capacity under MIF Warehousing Line | 15.0 |
New Unsecured Credit Facility [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
Line of Credit Facility, Current Borrowing Capacity | $ 200 |

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- Definition M/I Financial Maximum Borrowing Capacity + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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