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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2017
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 2017 and 2016 OPP Plans:
 
2017 OPP Plan
 
2016 OPP Plan
Maximum bonus pool, in millions
$20.0
 
$17.5
Performance period
1/1/2017 to 12/31/2019
 
1/1/2016 to 12/31/2018
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, 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 Company
23.00%
Expected price volatility for the particular REIT index
18.00%
Risk-free rate
1.63%
Dividend yield
3.20
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:
 
2017
 
2016
 
2015
Expected price volatility for the Company
24.00%
 
24.00%
 
22.00%
Expected price volatility for the particular REIT index
17.00%
 
17.00%
 
22.00%
Risk-free rate
1.47%
 
1.09%
 
1.13%
Dividend yield
2.30
 
2.40
 
1.50
Nonvested Restricted Stock Shares Activity
The following table summarizes the activity and status of all unvested awards:

 
 
2017
 
2016
 
2015
 
 
Shares
 
Weighted-Average Grant-Date Fair Value
 
Shares
 
Weighted-Average Grant-Date Fair Value
 
Shares
 
Weighted-Average Grant-Date Fair Value
Unvested at January 1
 
887,179

 
$
31.09

 
827,950

 
$
28.92

 
543,707

 
$
26.43

Granted
 
918,884

 
34.37

 
489,826

 
30.95

 
629,504

 
29.01

Vested
 
(705,508
)
 
31.42

 
(430,597
)
 
26.75

 
(335,544
)
 
24.80

Canceled
 
(13,369
)
 
32.14

 

 

 
(9,717
)
 
38.17

Unvested at December 31
 
1,087,186

 
$
33.64

 
887,179

 
$
31.09

 
827,950

 
$
28.92


Year Ended December 31,
 
Non-Vested Shares Issued
 
Weighted Average Grant-Date Fair Value
 
Vested Shares
 
Total Vest-Date Fair Value (in thousands)
2017
 
918,884

 
$
34.37

 
(705,508
)
 
$
24,155

2016
 
489,826

 
30.95

 
(430,597
)
 
14,736

2015
 
629,504

 
29.01

 
(335,544
)
 
9,606

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,
 
2017
 
2016
 
2015
Expensed stock compensation(1)
$
15,079

 
$
14,144

 
$
8,421

Capitalized stock compensation(2)
836

 
510

 
411

Total stock compensation(3)
$
15,915

 
$
14,654

 
$
8,832


_________________
(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.