Real Estate Activities (Revenues, Costs And Expenses Associated With Consolidated Condominium Activities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Real Estate Properties [Line Items]
Residential condominium revenues	$ 77,749	$ 78,612	$ 75,424	$ 73,531	$ 72,269	$ 72,895	$ 70,831	$ 69,143	$ 305,316	$ 285,138	$ 276,323
Residential condominium costs and expenses									(226,369)	(262,241)	(242,124)
Net gains on sales of condominiums									10,514	6,161	3,481
Condominium Communities [Member]
Real Estate Properties [Line Items]
Residential condominium revenues									57,944	68,500	21,999
Residential condominium costs and expenses									(48,407)	(62,339)	(18,518)
Net gains on sales of condominiums									10,514	6,161	3,481
Residential Condominium Units [Member]
Real Estate Properties [Line Items]
Net gains on sales of condominiums									9,537	6,161	3,481
Retail Condominium Unit [Member]
Real Estate Properties [Line Items]
Net gains on sales of condominiums									$ 977