Segment Reporting (Schedule Of Assets For The Reportable Segments) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Total assets	$ 2,932,553	$ 2,983,228
Owned And Managed [Member]
Segment Reporting Information [Line Items]
Total assets	2,632,773	2,698,509
Managed-Only [Member]
Segment Reporting Information [Line Items]
Total assets	121,378	127,960
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Total assets	176,345	154,598
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Total assets	$ 2,057	$ 2,161