Commitments and Contingencies (Details Textual) $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($)
Loss Contingencies [Line Items]
Surety bonds, outstanding, amount	$ 264.4
Letters of credit outstanding, amount	87.9
Estimated cost related to bonds	89.7
Estimated cost related to letters of credit	47.4
Option Contracts
Loss Contingencies [Line Items]
Letters of credit outstanding, amount	7.4
Earnest money deposits	17.8
HomeAmerican
Loss Contingencies [Line Items]
Letters of credit outstanding, amount	$ 62.0