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Commitments and Contingencies (Warranty activity) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]          
Letters of credit outstanding $ 200   $ 200   $ 200
Accrued Expenses          
Movement in Standard Product Warranty Accrual [Roll Forward]          
Beginning balance 2,539 $ 1,503 2,083 $ 1,210  
Additions 569 362 1,697 1,116  
Charges (458) (324) (1,130) (785)  
Ending balance 2,650 $ 1,541 $ 2,650 $ 1,541  
Home Warranty, Defects and Products Used          
Product Warranty Liability [Line Items]          
Term of warranty     1 year    
Home Warranty, Electrical, Mechanical and Plumbing Systems          
Product Warranty Liability [Line Items]          
Term of warranty     2 years    
Home Warranty, Qualified and Defined Structural Defects          
Product Warranty Liability [Line Items]          
Term of warranty     10 years    
Developed Lots Warranty          
Product Warranty Liability [Line Items]          
Term of warranty     1 year    
Performance Bonds          
Product Warranty Liability [Line Items]          
Amount of performance bonds outstanding $ 5,800   $ 5,800   $ 3,600