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Allowance for Doubtful Accounts (Details) (USD $)	3 Months Ended		9 Months Ended
Allowance for Doubtful Accounts (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 item	Sep. 30, 2011	Dec. 31, 2011
Allowance for Doubtful Accounts
Balance in allowance for doubtful accounts	$ 218,000		$ 218,000		$ 335,000
Bad debt expense for continuing operations	16,000	6,000	56,000	514,000
Net recoveries of previously recognized bad debt expense for discontinued operations	$ 116,000		$ 173,000
Number of tenants from whom bad debt is recovered			1

- Definition

Reflects a reduction in bad debt expense attributable to collections of loans and lease receivables which had previously been fully or partially charged off as bad debts.

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