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Stock Based Compensation (Tables)
9 Months Ended
Sep. 30, 2011
Stock Based Compensation [Abstract] 
Schedule of Nonvested Share Activity
A detail of Piedmont’s unvested employee deferred stock awards as of September 30, 2011 is as follows:

Date of grant
Net  Shares

Granted(1)
 
Grant
Date Fair
Value
 
Vesting Schedule
 
Unvested Shares as of
September 30, 2011
May 6, 2009
135,564

 
$
22.20

 
Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 6, 2010, 2011, and 2012, respectively.
 
44,393

May 24, 2010
180,340

 
$
18.71

 
Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 24, 2011, 2012, and 2013, respectively.
 
107,473

May 24, 2010
46,440

 
$
18.71

 
Of the shares granted, 33.33% vested or will vest on May 24, 2011, 2012, and 2013, respectively.
 
35,268

April 5, 2011
142,468

 
$
19.40

 
Of the shares granted, 25% vested on the date of grant, and 25% will vest on April 5, 2012, 2013, and 2014, respectively.
 
115,746

Total
 
 
 
 
 
 
302,880


(1) 
Amounts reflect the total grant, net of cumulative shares surrendered upon vesting to satisfy required minimum tax withholding obligations through September 30, 2011.