Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Fee and Other Income
Management, development, financing and other fee income	$ 47,539	$ 54,592	$ 58,734
Ancillary and other property income	29,346	20,991	20,685
Lease termination fees	5,897	7,497	3,983
Other miscellaneous	621	2,139	2,219
Total fee and other operating income	$ 83,403	$ 85,219	$ 85,621