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Summary of Significant Accounting Policies (Allowance for Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of Significant Accounting Policies [Line Items]
Provision for doubtful accounts	$ 1,523	$ 1,743	$ 2,891
Allowance for Tenant Receivables [Member]
Summary of Significant Accounting Policies [Line Items]
Provision for doubtful accounts	$ 1,523	$ 1,682	$ 2,726

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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