Acquisitions (Details) (Independance Plaza [Member], USD $) In Thousands, unless otherwise specified	0 Months Ended
	Dec. 21, 2012 Rooms	Mar. 31, 2013
Business Acquisition [Line Items]
Variable Interest Entity Ownership Percentage	58.75%
Number of Units in Real Estate Property	1,328
Purchase Price Allocation, Assets Acquired		$ 844,800
Land [Member]
Business Acquisition [Line Items]
Purchase Price Allocation, Land	309,848
Purchase Price Allocation, Assets Acquired		602,662
Building Improvements [Member]
Business Acquisition [Line Items]
Purchase Price Allocation, Buildings	527,578
Purchase Price Allocation, Assets Acquired		252,844
Acquired above-market leases (included in identified intangible assets) [Member]
Business Acquisition [Line Items]
Purchase Price Allocation, Assets Acquired		13,115
Acquired in-place leases (included in other assets) [Member]
Business Acquisition [Line Items]
Purchase Price Allocation, Assets Acquired		67,879
Other Assets [Member]
Business Acquisition [Line Items]
Purchase Price Allocation, Assets Acquired		7,374
Acquired below-market leases (included in deferred revenue) [Member]
Business Acquisition [Line Items]
Purchase Price Allocation, Assets Acquired		$ (99,074)