Commitments and Contingencies Legal (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended			48 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018
Legal Liabilities Disclosure [Abstract]
Charges related to stucco-related claims	$ 1,000	$ 0	$ 0	$ 8,500	$ 28,400
Insurance Recoveries	1,000	1,100
Estimated Repair Costs for Affected Homes		4,500
Amount Reserved for Legal Expenses	$ 400	$ 700	$ 400		$ 400