Commitments and Contingencies Warranty Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Warranty Accrual Rollforward [Abstract]
Warranty reserves, beginning of period	$ 25,220	$ 24,301	$ 26,459	$ 26,133
Warranty expense on homes delivered during the period	3,641	3,299	6,481	5,842
Changes in estimates for pre-existing warranties	557	557	735	465
Charges related to stucco-related claims	0	0	0	0
Settlements made during the period	(3,944)	(4,878)	(8,201)	(9,161)
Warranty reserves, end of period	25,474	$ 23,279	25,474	$ 23,279
Estimated Repair Costs for Affected Homes	$ 5,300		$ 5,300