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Fair Value Measurements Fair Value of Financial Instrument Assumptions (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Fair Value of Financial Instrument Assumptions [Line Items] |  |
Letters of Credit Potential Commitments, Amount | $ 37,676 | $ 42,503
First Amendment to New Unsecured Credit Facility [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | 400,000 |
Warehousing Agreement - Second Amended and Restated [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
M/I Financial Maximum Borrowing Capacity | 125,000 |
Amendment No. 1 to Amended and Restated Repurchase Agreement [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
M/I Financial Maximum Borrowing Capacity | $ 15,000 |

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