Estimated Development Liability for Sold Land (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Estimated Development Liability for Sold Land [Abstract]
Number of estimated homes the estimated liability covers	8,000
Gross estimated unexpended costs	$ 35,860		$ 35,879
Less costs relating to unsold homesites	(2,905)		(2,905)
Estimated development liability for sold land	32,955		32,974
Charges related to estimated liability for sold land	$ 19	$ 100