Real Estate Inventories Inventory Impairments (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Inventory Disclosure [Abstract]
Impairment of Real Estate Homes	$ 10,000	$ 0	$ 0	$ 0	$ 900	$ 0	$ 1,300	$ 0	$ 10,000	$ 2,200	$ 2,350
Impairment of Real Estate Land									0	0	1,150
Total Inventory Impairments									10,000	2,200	3,500
Remaining Carrying Value of Inventory Impaired									$ 57,845	$ 5,921	$ 30,225
Number of Projects Impaired									2	1	3
Number of Projects Reviewed for Impairment									26	26	27