Guarantees and Indemnifications Warranty Rollforward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Warranty Accrual Rollforward [Abstract]
Warranty reserves, beginning of period	$ 10,388	$ 8,733	$ 10,438	$ 9,025
Warranty expense on homes delivered during the period	1,999	1,646	5,004	4,021
Changes in estimates for pre-existing warranties	321	141	422	231
Settlements made during the period	(1,952)	(1,524)	(5,108)	(4,281)
Warranty reserves, end of period	$ 10,756	$ 8,996	$ 10,756	$ 8,996