Fee and Other Income (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Other Operating Income
Management, development and other fee income	$ 11,900,000	$ 13,200,000	$ 23,600,000	$ 27,200,000
Ancillary and other property income	7,100,000	4,600,000	14,300,000	9,300,000
Lease termination fees	800,000	3,000,000	1,300,000	3,600,000
Financing fees	200,000	200,000	600,000	400,000
Other miscellaneous	100,000	1,300,000	300,000	1,800,000
Other Operating Income	$ 20,080,000	$ 22,327,000	$ 40,114,000	$ 42,284,000