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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 Key Components of Share-based Awards The following table outlines key components of the 2018 and 2017 OPP Plans:
2018 OPP Plan2017 OPP Plan
Maximum bonus pool, in millions$25.0 $20.0 
Performance period1/1/2018 to 12/31/20201/1/2017 to 12/31/2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested Restricted Stock Shares Activity
The following table summarizes the activity and status of all unvested stock awards:

201820172016
SharesWeighted-Average Grant-Date Fair ValueSharesWeighted-Average Grant-Date Fair ValueSharesWeighted-Average Grant-Date Fair Value
Unvested at January 11,087,186 $33.64 887,179 $31.09 827,950 $28.92 
Granted190,557 29.53 918,884 34.37 489,826 30.95 
Vested(571,481)32.74 (705,508)31.42 (430,597)26.75 
Canceled(2,466)33.38 (13,369)32.14 — — 
Unvested at December 31703,796 $32.93 1,087,186 $33.64 887,179 $31.09 

Year Ended December 31,Non-Vested Shares IssuedWeighted Average Grant-Date Fair ValueVested SharesTotal Vest-Date Fair Value (in thousands)
2018190,557 $29.53 (571,481)$16,735 
2017918,884 34.37 (705,508)24,155 
2016489,826 30.95 (430,597)14,736 
Stock Compensation Related to OPP Plans and Restricted Stock 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,
201820172016
Expensed stock compensation(1)
$17,028 $15,079 $14,144 
Capitalized stock compensation(2)
1,097 836 510 
Total stock compensation(3)
$18,125 $15,915 $14,654 
_________________
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.
Outperformance Program  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
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:
201820172016
Expected price volatility for the Company 20.00%  24.00%  24.00%  
Expected price volatility for the particular REIT index18.00%  17.00%  17.00%  
Risk-free rate2.37%  1.47%  1.09%  
Dividend yield2.90%  2.30%  2.40%  
One-Time Retention Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Valuation Assumptions
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%