Commitments and Contingencies (Details Textual) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) lots
Loss Contingencies [Line Items]
Surety bonds, outstanding, amount	$ 256.3
Letters of credit outstanding, amount	126.3
Estimated cost related to bonds	82.5
Estimated cost related to letters of credit	$ 96.0
Number of lots | lots	7,757
Option Contracts
Loss Contingencies [Line Items]
Letters of credit outstanding, amount	$ 7.6
Deposits	22.1
HomeAmerican
Loss Contingencies [Line Items]
Surety bonds, outstanding, amount	100.9
Letters of credit outstanding, amount	$ 100.9