Fair Value Disclosures Fair Value Disclosure (Details) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Fair Value Disclosures [Abstract]
Assets, Fair Value Adjustment											$ 0
Debt Instrument, Unamortized Discount	$ 2,200								$ 2,200
Debt Instrument, Unamortized Premium	1,800								1,800
Debt Instrument, Unamortized Debt Issuance Costs	5,900								$ 5,900
Number of Projects Impaired									1	2
Impairment of Real Estate									$ 2,200	$ 3,500	0
Impairment of Real Estate Homes	$ 900	$ 0	$ 1,300	$ 0	$ 2,350	$ 0	$ 0	$ 0	2,200	2,350	0
Impairment of Real Estate Land					$ 1,150	$ 0	$ 0	$ 0	0	1,150	0
Remaining Carrying Value of Inventory Impaired									$ 5,921	$ 30,225	0
Liabilities, Fair Value Adjustment											$ 0