Segment Reporting (Schedule Of Assets For The Reportable Segments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total assets	$ 2,971,126	$ 3,019,631
Owned And Managed [Member]
Segment Reporting Information [Line Items]
Total assets	2,699,814	2,711,926
Managed-Only [Member]
Segment Reporting Information [Line Items]
Total assets	110,823	123,806
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Total assets	160,473	180,220
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Total assets	$ 16	$ 3,679