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Mortgage and Other Notes Receivable (Tables)
9 Months Ended
Sep. 30, 2011
Mortgage and Other Notes Receivable [Abstract] 
Rollforward allowance for credit losses
A rollforward of the allowance for credit losses for the nine months ended September 30, 2011 is as follows:
 
Beginning Balance, January 1, 2011 
$
—

Additions in allowance charged to expense 
1,900

Reduction for charges against allowance 
(1,900
)
Ending Balance, September 30, 2011
$
—