Guarantees and Indemnifications Warranty Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Warranty Accrual Rollforward [Abstract]
Warranty reserves, beginning of period	$ 10,638	$ 11,220	$ 12,671	$ 12,291
Warranty expense on homes delivered during the period	2,263	1,923	5,847	4,962
Changes in estimates for pre-existing warranties	905	1,047	1,580	1,937
Settlements made during the period	(3,328)	(3,508)	(9,620)	(8,508)
Warranty reserves, end of period	$ 10,478	$ 10,682	$ 10,478	$ 10,682