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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2011
Commitments and Contingencies [Abstract] 
Schedule of Letters of Credit
As of September 30, 2011, Piedmont was subject to the following letters of credit, which reduce the total outstanding capacity under its $500 Million Unsecured Facility:

Amount
 
Expiration of Letter of Credit (1)
$
382,556

 
August 2012
$
14,782,820

 
February 2012
$
2,006,589

 
December 2011
$
9,033,164

 
June 2012

(1) 
These letter of credit agreements automatically renew for consecutive, one-year periods each anniversary, subject to the satisfaction of the credit obligation and certain other limitations.