Real Estate Activity (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Real Estate Properties [Line Items]
Number of units in real estate property	21,622
Condominium units, for-sale and under construction, aggregate carrying value	$ 48,767		$ 54,845
Condominium homes sold	19	12
Income tax benefit	612
Austin Condominium Project [Member]
Real Estate Properties [Line Items]
Number of units in real estate property	148
Condominium units, for-sale and under construction, aggregate carrying value	32,246
Atlanta Condominium Project [Member]
Real Estate Properties [Line Items]
Number of units in real estate property	129
Condominium units, for-sale and under construction, aggregate carrying value	$ 16,521