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Inventory - Inventory Fair Value Unobservable Inputs (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
home
community
Minimum  
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)  
Average selling price ($000s) $ 253
Sales pace per quarter (units) | community 5
Maximum  
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)  
Average selling price ($000s) $ 461
Sales pace per quarter (units) | home 9
Measurement Input, Discount Rate | Minimum  
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)  
Discount rate 18.00%
Measurement Input, Discount Rate | Maximum  
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)  
Discount rate 25.00%