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Tenant Receivables (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Tenant Receivables [Abstract]
Tenant receivables, net of allowance for doubtful accounts of $631 and $1,298 as of December 31, 2011 and 2010, respectively	$ 24,722	$ 28,849
Cumulative rental revenue recognized on a straight-line basis in excess of cash received in accordance with lease terms	104,801	105,157
Tenant receivables	129,523	134,006
Allowance for Doubtful Accounts Receivable	$ 631	$ 1,298

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property, by the lessor or lessee, respectively. Such receivable is reduced by allowances attributable to, for instance, credit risk associated with a lessee.

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