Accounts Receivable, Net (Schedule Of Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Straight-line rent receivable	$ 26,499		$ 27,003
Deferred rent receivable	4,420	[1]	4,420	[1]
Allowance for doubtful accounts	(5,152)		(6,691)
Total	35,005		39,814
Rent deferral payments interest rate	8.70%
Tenants [Member]
Accounts receivable, gross	6,874		11,634
Non-Tenants [Member]
Accounts receivable, gross	1,265		155
Canada Revenue Agency [Member]
Accounts receivable, gross	1,099		3,293
Private Equity Firm Guarantor [Member]
Deferred rent receivable	3,400
Other Guarantor [Member]
Deferred rent receivable			$ 1,000

[1] Rent deferral payments of $3.4 million are guaranteed by a private equity firm. During the year ended December 31, 2010, the Company also granted an additional rent deferral of $1.0 million that is not guaranteed by the private equity firm. This amount has been fully reserved at December 31, 2011 and 2010. Rent deferral payments are due on or before December 31, 2018 and bear interest at 8.7%.