Commitments and Contingencies Warranty Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Warranty Accrual Rollforward [Abstract]
Warranty reserves, beginning of period	$ 26,175	$ 25,474	$ 26,420	$ 26,459
Warranty expense on homes delivered during the period	4,961	3,851	12,624	10,332
Changes in estimates for pre-existing warranties	416	255	(228)	990
Charges related to stucco-related claims	0	0	0	0
Settlements made during the period	(4,578)	(4,044)	(11,842)	(12,245)
Warranty reserves, end of period	26,974	$ 25,536	26,974	$ 25,536
Estimated Repair Costs for Affected Homes	$ 3,700		3,700
Insurance Recoveries			(500)
Stucco Repair Cost			$ 500