Guarantees and Indemnifications Warranty Rollforward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Warranty Accrual Rollforward [Abstract]
Warranty reserves, beginning of period	$ 10,400	$ 8,548	$ 10,438	$ 9,025
Warranty expense on homes delivered during the period	1,667	1,333	3,005	2,375
Changes in estimates for pre-existing warranties	101	147	101	90
Settlements made during the period	(1,780)	(1,295)	(3,156)	(2,757)
Warranty reserves, end of period	$ 10,388	$ 8,733	$ 10,388	$ 8,733