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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Key Components of OPP Plan The following table outlines key components of the 2019 and 2018 OPP Plans:
2019 OPP Plan
2018 OPP Plan
Maximum bonus pool, in millions$28.0  $25.0  
Performance period1/1/2019 to 12/31/20211/1/2018 to 12/31/2020
Schedule of Valuation Assumptions
The per unit fair value of OPP award granted was estimated on the date of grant using the following assumptions in the Monte Carlo valuation:
201920182017
Expected price volatility for the Company 22.00%  20.00%  24.00%  
Expected price volatility for the particular REIT index18.00%  18.00%  17.00%  
Risk-free rate2.57%  2.37%  1.47%  
Dividend yield3.00%  2.90%  2.30%  
The per unit fair value of one-time retention award granted was estimated on the date of grant using the following assumptions in the Monte Carlo valuation:
Assumptions
Expected price volatility for the Company23.00%  
Expected price volatility for the particular REIT index18.00%  
Risk-free rate1.63%  
Dividend yield3.20%  
Summary of Activity and Status of Unvested Stock Awards
The following table summarizes the activity and status of all unvested stock awards:
201920182017
SharesWeighted-Average Grant-Date Fair ValueSharesWeighted-Average Grant-Date Fair ValueSharesWeighted-Average Grant-Date Fair Value
Unvested at January 1703,796  $32.93  1,087,186  $33.64  887,179  $31.09  
Granted247,521  35.50  190,557  29.53  918,884  34.37  
Vested(470,019) 32.88  (571,481) 32.74  (705,508) 31.42  
Canceled(21,514) 34.16  (2,466) 33.38  (13,369) 32.14  
Unvested at December 31459,784  $33.67  703,796  $32.93  1,087,186  $33.64  

Year Ended December 31,Non-Vested Shares IssuedWeighted Average Grant-Date Fair ValueVested SharesTotal Vest-Date Fair Value (in thousands)
2019247,521  $35.50  (470,019) $17,009  
2018190,557  $29.53  (571,481) $16,735  
2017918,884  $34.37  (705,508) $24,155  
Summary of Activity and Status of Unvested Performance Units
The following table summarizes the activity and status of all unvested time-based restricted operating partnership performance units:
20192018
UnitsWeighted-Average Grant-Date Fair ValueUnitsWeighted-Average Grant-Date Fair Value
Unvested at January 1318,549  $28.41  —  $—  
Granted481,215  35.74  318,549  28.41  
Vested(191,085) 30.37  —  —  
Canceled—  —  —  —  
Unvested at December 31608,679  $32.70  318,549  $28.41  
Stock-Based Compensation Related to Company's Awards
The following table presents the classification and amount recognized for stock-based compensation related to the Company’s awards: 
For the Year Ended December 31,
201920182017
Expensed stock compensation(1)
$19,481  $17,028  $15,079  
Capitalized stock compensation(2)
951  1,097  836  
Total stock compensation(3)
$20,432  $18,125  $15,915  
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1.Amounts are recorded in general and administrative expenses in the Consolidated Statements of Operations.
2.Amounts are recorded in deferred leasing costs and lease intangible assets, net and investment in real estate, at cost in the Consolidated Balance Sheets.
3.Amounts are recorded in additional paid-in capital and non-controlling interest—units in the operating partnership in the Consolidated Balance Sheets.