Guarantees and Indemnifications Warranty Rollforward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Warranty Accrual Rollforward [Abstract]
Warranty accrual, beginning of period	$ 8,548	$ 7,925	$ 9,025	$ 8,335
Warranty expense on homes delivered during the period	1,333	1,100	2,375	1,969
Changes in estimates for pre-existing warranties	147	30	90	(100)
Settlements made during the period	(1,295)	(1,220)	(2,757)	(2,369)
Warranty accrual, end of period	$ 8,733	$ 7,835	$ 8,733	$ 7,835