Commitments and Contingencies Warranty Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Warranty Accrual Rollforward [Abstract]
Warranty reserves, beginning of period	$ 25,474	$ 23,279	$ 26,459	$ 26,133
Warranty expense on homes delivered during the period	3,851	3,353	10,332	9,195
Changes in estimates for pre-existing warranties	255	417	990	882
Charges related to stucco-related claims	0	0	0	0
Settlements made during the period	(4,044)	(4,508)	(12,245)	(13,669)
Warranty reserves, end of period	25,536	$ 22,541	25,536	$ 22,541
Estimated Repair Costs for Affected Homes	$ 5,000		$ 5,000