Accounts Receivable, Net (Schedule Of Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Straight-line rent receivable	$ 31,796	$ 30,891
Allowance for doubtful accounts	(4,304)	(3,852)
Total	38,246	38,738
Tenants [Member]
Carrying amounts of accounts receivable	9,274	9,379
Non-Tenants [Member]
Carrying amounts of accounts receivable	484	1,527
Canada Revenue Agency [Member]
Carrying amounts of accounts receivable	$ 996	$ 793