Investment in Joint Venture Arrangements Investment in Joint Venture Arrangements Balance Sheet Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]
Single-family lots, land and land development costs (a) (b)	$ 11,182	$ 13,289
Other assets	938	5,143
Total assets	12,120	18,432
Notes payable	2,318	261
Other liabilities	599	1,544
Total liabilities	2,917	1,805
Company’s equity (a) (b)	2,525	8,328
Other equity	6,678	8,299
Total partners’ equity	9,203	16,627
Total liabilities and partners’ equity	12,120	18,432
Reduction of impairment relating to joint venture arrangements	(49)	1,733
Company's investment in joint development or similar agreements	$ 33,296	$ 13,930