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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Nonvested Share Activity
A rollforward of Piedmont's equity based award activity for the year ended December 31, 2020 is as follows:

SharesWeighted-Average Grant Date Fair Value
Unvested and Potential Stock Awards as of December 31, 2019
1,045,020 $25.15 
Deferred Stock Awards Granted
242,586 $22.39 
Increase in Estimated Potential Share Awards based on TSR Performance
111,545 $26.97 
Performance Stock Awards Vested
(153,368)$30.45 
Deferred Stock Awards Vested
(229,274)$21.05 
Deferred Stock Awards Forfeited
(6,979)$21.82 
Unvested and Potential Stock Awards as of December 31, 2020
1,009,530 $24.37 


The following table provides additional information regarding stock award activity during the years ended 2020, 2019, and 2018 (in thousands except for per share amounts):
202020192018
Weighted-Average Grant Date Fair Value of Deferred Stock Granted During the Period
$22.39 $21.02 $17.84 
Total Grant Date Fair Value of Deferred Stock Vested
During the Period
$4,826 $8,658 $6,378 
Share-based Liability Awards Paid During the Period (1)
$4,116 $6,683 $2,947 

(1)Amounts reflect the issuance of performance share awards related to the 2017-19, 2016-18, and 2015-17 Performance Share Plans during the years ended December 31, 2020, 2019, and 2018 respectively, as well as performance share award liabilities settled in cash in July 2019 for retirement and separation associated with the senior management transition on June 30, 2019.
Schedule of Outstanding Employee Deferred Stock Awards
A detail of Piedmont’s outstanding employee restricted stock awards as of December 31, 2020 is as follows:

Date of grantType of Award
Net  Shares
Granted (1)
Grant
Date Fair
Value		Vesting Schedule
Unvested and Potential Shares as of December 31, 2020
May 17, 2018Deferred Stock Award250,627 $17.84 
Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 17, 2019, 2020, and 2021, respectively.
52,740 
May 17, 2018Fiscal Year 2018-2020 Performance Share Program— $23.52 Shares awarded, if any, will vest immediately upon determination of award in 2021.200,674 
(2)
May 3, 2019Deferred Stock Award274,904 $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.
133,900 
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 Award178,181 $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.
143,605 
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)
May 13, 2020Deferred Stock Award-Board of Directors45,780 $13.76 
Of the shares granted, 100% will vest by May 13, 2021.
45,780 
Total1,009,530 

(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 December 31, 2020.
(2)Estimated based on Piedmont's cumulative TSR for the respective performance period through December 31, 2020. Share estimates are subject to change in future periods based upon Piedmont's relative performance compared to its peer group of office REITs' TSR.