Commitments and Contingencies Legal (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended			36 Months Ended
	Dec. 31, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017
Legal Liabilities Disclosure [Abstract]
Charges related to stucco-related claims	$ 1,000	$ 8,500	$ 0	$ 8,500	$ 19,409	$ 28,400
Insurance Recoveries			1,000
Estimated Repair Costs for Affected Homes	6,300		6,300
Amount Reserved for Legal Expenses	$ 351		$ 351	$ 405		$ 405