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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
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 year ended December 31, 2018 is as follows:

 
Shares
 
Weighted-Average Grant Date Fair Value
Unvested and Potential Stock Awards as of December 31, 2017
868,437

 
$
21.69

Deferred Stock Awards Granted
354,236

 
$
17.84

Increase in Estimated Potential Future Performance Share Awards, net of forfeitures
506,793

 
$
25.20

Performance Stock Awards Vested
(161,005
)
 
$
18.47

Deferred Stock Awards Vested
(332,019
)
 
$
19.21

Deferred Stock Awards Forfeited
(8,959
)
 
$
19.77

Unvested and Potential Stock Awards as of December 31, 2018
1,227,483

 
$
23.14



The following table provides additional information regarding stock award activity during the years ended December 31, 2018, 2017, and 2016 (in thousands except for per share data):

 
2018
 
2017
 
2016
Weighted-Average Grant Date Fair Value of Deferred Stock Granted During the Period (per share)
$
17.84

 
$
21.38

 
$
19.96

Total Grant Date Fair Value of Deferred Stock Vested
During the Period
$
6,378

 
$
5,899

 
$
4,806

Share-based Liability Awards Paid During the Period (1)
$
2,947

 
$
2,877

 
$
1,127


(1) 
Amounts reflect the issuance of performance share awards related to the 2015-17, 2014-16, and 2013-15 Performance Share Plans during the years ended December 31, 2018, 2017, and 2016 respectively.
Schedule of Outstanding Employee Deferred Stock Awards A detail of Piedmont’s outstanding employee deferred stock awards as of December 31, 2018 is as follows:

Date of grant
 
Type of Award
 
Net  Shares
Granted (1)
 
Grant
Date Fair
Value
 
Vesting Schedule
 
Unvested and Potential Shares as of
December 31, 2018
 
January 3, 2014
 
Deferred Stock Award
 
72,969

 
$
16.45

 
Of the shares granted, 20% vested or will vest on January 3, 2015, 2016, 2017, 2018, and 2019, respectively.
 
16,416

 
May 24, 2016
 
Deferred Stock Award
 
208,003

 
$
19.91

 
Of the shares granted, 25% vested on the date of grant, and 25% of the shares vest on May 24, 2017, 2018, and 2019, respectively.
 
60,487

 
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.
 
139,127

(2) 
May 18, 2017
 
Deferred Stock Award
 
219,863

 
$
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.
 
123,343

 
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.
 
251,123

(2) 
May 17, 2018
 
Deferred Stock Award-Board of Directors
 
31,388

 
$
17.84

 
Of the shares granted, 100% will vest by May 17, 2019.
 
31,388

 
May 17, 2018
 
Deferred Stock Award
 
302,706

 
$
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.
 
239,567

 
May 17, 2018
 
Fiscal Year 2018-2020 Performance Share Program
 
—

 
$
23.52

 
Shares awarded, if any, will vest immediately upon determination of award in 2021.
 
366,032

(2) 
Total
 
1,227,483

 

(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, 2018.
(2) 
Estimated based on Piedmont's cumulative TSR for the respective performance period through December 31, 2018. Share estimates are subject to change in future periods based upon Piedmont's relative performance compared to its peer group of office REITs' total stockholder return.