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Stock Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Nonvested Share Activity
A rollforward of Piedmont's equity based award activity for the nine months ended September 30, 2021 is as follows:
SharesWeighted-Average Grant Date Fair Value
Unvested and Potential Stock Awards as of December 31, 2020
1,009,530 $24.37 
Deferred Stock Awards Granted
331,354 $17.24 
Increase in Estimated Potential Share Awards based on TSR Performance
165,769 $23.04 
Performance Stock Awards Vested
(200,674)$23.52 
Deferred Stock Awards Vested
(277,409)$18.77 
Deferred Stock Awards Forfeited
(26,803)$19.53 
Unvested and Potential Stock Awards as of September 30, 2021
1,001,767 $23.64 
The following table provides additional information regarding stock award activity during the three and nine months ended September 30, 2021 and 2020, respectively (in thousands, except per share amounts):

Three Months EndedNine Months Ended
September 30,
2021		September 30,
2020		September 30,
2021		September 30,
2020
Weighted-Average Grant Date Fair Value per share of Deferred Stock Granted During the Period
$— $— $17.24 $22.39 
Total Grant Date Fair Value of Deferred Stock Vested During the Period
$206 $200 $5,208 $4,808 
Share-based Liability Awards Paid During the Period (1)
$— $— $3,610 $4,116 

(1)Reflects the value of stock earned pursuant to the 2018-20 and 2017-19 Performance Share Plans during the nine months ended September 30, 2021 and 2020, respectively.
Schedule of Outstanding Employee Stock Awards
A detail of Piedmont’s outstanding stock awards and programs as of September 30, 2021 is as follows:
Date of grantType of Award
Net Shares
Granted (1)
Grant
Date Fair
Value		Vesting ScheduleUnvested Shares
May 3, 2019Deferred Stock Award250,745 $21.04 
Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 3, 2020, 2021, and 2022, respectively.
73,335 
May 3, 2019Fiscal Year 2019-2021 Performance Share Program— $29.43 Shares awarded, if any, will vest immediately upon determination of award in 2022.224,900 
(2)
February 19, 2020Deferred Stock Award159,119 $24.41 
Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on February 19, 2021, 2022, and 2023, respectively.
88,855 
March 19, 2020Fiscal Year 2020-2022 Performance Share Program— $25.83 Shares awarded, if any, will vest immediately upon determination of award in 2023.207,931 
(2)
February 17, 2021Deferred Stock Award266,442 $17.15 
Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on February 17, 2022, 2023, and 2024, respectively.
205,900 
February 18, 2021Fiscal Year 2021-2023 Performance Share Program— $23.04 Shares awarded, if any, will vest immediately upon determination of award in 2024.165,769 
(2)
May 11, 2021Deferred Stock Award-Board of Directors35,077 $17.96 
Of the shares granted, 100% will vest by May 11, 2022.
35,077 
Total1,001,767 

(1)Amounts reflect the total original grant to employees and independent directors, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through September 30, 2021.
(2)Estimated based on Piedmont's cumulative TSR for the respective performance period through September 30, 2021. Share estimates are subject to change in future periods based upon Piedmont's relative TSR performance compared to its peer group of office REITs.