Estimated Development Liability for Sold Land (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 homesite	Sep. 30, 2012	Sep. 30, 2013 homesite	Sep. 30, 2012	Dec. 31, 2012
Estimated Development Liability for Sold Land [Abstract]
Number of estimated homes the estimated liability covers (homesites)	8,000		8,000
Gross estimated unexpended costs	$ 36,126		$ 36,126		$ 35,879
Less costs relating to unsold homesites	(2,885)		(2,885)		(2,905)
Estimated development liability for sold land	33,241		33,241		32,974
Charges related to estimated liability for sold land	$ 17	$ 0	$ 46	$ 120