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Stock Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Share Activity
A rollforward of Piedmont's equity based award activity for the nine months ended September 30, 2017 is as follows:

 
Shares
 
Weighted-Average Grant Date Fair Value
Unvested Stock Awards as of December 31, 2016
944,223

 
$
19.44

Deferred Stock Awards Granted
299,251

 
$
21.38

Change in Estimated Potential Future Performance Share Awards, net of forfeitures
(7,828
)
 
$
23.65

Performance Stock Awards Vested
(118,446
)
 
$
22.00

Deferred Stock Awards Vested
(302,474
)
 
$
19.35

Deferred Stock Awards Forfeited
(7,200
)
 
$
19.79

Unvested Stock Awards as of September 30, 2017
807,526

 
$
21.39



The following table provides additional information regarding stock award activity during the three and nine months ended September 30, 2017 and 2016, respectively (in thousands, except per share amounts):

 
Three Months Ended
 
Nine Months Ended
 
September 30,
2017
 
September 30,
2016
 
September 30,
2017
 
September 30,
2016
Weighted-Average Grant Date Fair Value of Deferred Stock Granted During the Period
$
—

 
$
—

 
$
21.38

 
$
19.96

Total Grant Date Fair Value of Deferred Stock Vested During the Period
$
11

 
$
108

 
$
5,852

 
$
4,766

Share-based Liability Awards Paid During the Period(1)
$
—

 
$
—

 
$
2,877

 
$
1,127



(1) 
Amounts reflect the issuance of performance share awards related to the 2014-16 and 2013-15 Performance Share Plans during the nine months ended September 30, 2017 and 2016, respectively.
Schedule of Outstanding Employee Stock Awards
A detail of Piedmont’s outstanding stock awards as of September 30, 2017 is as follows:

Date of grant
 
Type of Award
 
Net Shares
Granted (1)
 
Grant
Date Fair
Value
 
Vesting Schedule
 
Unvested Shares as of September 30, 2017
 
January 3, 2014
 
Deferred Stock Award
 
86,769

 
$
16.56

 
Of the shares granted, 20% vested or will vest on January 3, 2015, 2016, 2017, 2018, and 2019, respectively.
 
35,094

 
May 1, 2015
 
Deferred Stock Award
 
216,837

 
$
17.59

 
Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 1, 2016, 2017, and 2018, respectively.
 
67,114

 
May 1, 2015
 
Fiscal Year 2015-2017 Performance Share Program
 
—

 
$
18.42

 
Shares awarded, if any, will vest immediately upon determination of award in 2018.
 
143,846

(2) 
May 24, 2016
 
Deferred Stock Award
 
233,011

 
$
19.91

 
Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 24, 2017, 2018, and 2019, respectively.
 
133,092

 
May 24, 2016
 
Fiscal Year 2016-2018 Performance Share Program
 
—

 
$
23.02

 
Shares awarded, if any, will vest immediately upon determination of award in 2019.
 
103,790

(2) 
May 18, 2017
 
Deferred Stock Award-Board of Directors
 
26,187

 
$
21.38

 
Of the shares granted, 100% will vest by May 18, 2018.
 
26,187

 
May 18, 2017
 
Deferred Stock Award
 
246,740

 
$
21.38

 
Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 18, 2018, 2019, and 2020, respectively.
 
200,899

 
May 18, 2017
 
Fiscal Year 2017-2019 Performance Share Program
 
—

 
$
30.45

 
Shares awarded, if any, will vest immediately upon determination of award in 2020.
 
97,504

(2) 
Total
 
 
 
 
 
 
 
 
 
807,526

 

(1) 
Amounts reflect the total grant to employees and independent directors, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through September 30, 2017.
(2) 
Estimated based on Piedmont's cumulative TSR for the respective performance period through September 30, 2017. Share estimates are subject to change in future periods based upon Piedmont's relative performance compared to its peers' total stockholder return.