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Debt MIF Warehousing Agreement (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]    
Maximum Borrowing Availability under all Credit Lines $ 185,000 $ 185,000
Notes payable bank - financial service operations 91,275 $ 152,895
Warehousing Agreement - First Amendment to Second Amended and Restated [Member]    
Debt Instrument [Line Items]    
M/I Financial Maximum Borrowing Capacity 125,000  
M/I Financial Temporary Increase Maximum Borrowing Capacity $ 150,000  
LIBOR basis points 237.5  
Debt Instrument, Basis Spread on Variable Rate 2.75%  
Repurchase Agreement - Amendment No. 4 [Member]    
Debt Instrument [Line Items]    
M/I Financial Maximum Borrowing Capacity $ 35,000  
Minimum [Member] | Repurchase Agreement - Amendment No. 4 [Member]    
Debt Instrument [Line Items]    
LIBOR basis points 250  
Maximum [Member] | Repurchase Agreement - Amendment No. 4 [Member]    
Debt Instrument [Line Items]    
LIBOR basis points 275