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STOCK BASED PLANS
 9 Months Ended
Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
STOCK BASED PLANS STOCK BASED PLANS
 
The Company's stock based plans are described and informational disclosures are provided in the Notes to the Financial Statements included in the Annual Report.

Stock Options
 
The following table summarizes the Company's stock option plan activity for the nine months ended September 30, 2019:
 
 
Stock
Options
 
Weighted
Average
Exercise Price
Stock Options outstanding at December 31, 2018
 
817,998

 
$
105.06

Granted
 
21,500

 
105.37

Exercised
 
(35,594
)
 
62.47

Forfeited
 
(23,000
)
 
124.02

Expired
 
(12,400
)
 
144.31

Stock Options outstanding at September 30, 2019
 
768,504

 
$
105.84



Compensation costs related to stock options were $0.7 million and $2.2 million for the three and nine months ended September 30, 2019, respectively, of which zero and $0.4 million were capitalized to development projects, respectively. Compensation costs related to stock options were $0.9 million and $2.6 million for the three and nine months ended September 30, 2018, respectively, of which $0.3 million and $1.2 million were capitalized to development projects, respectively.
 
Restricted Stock
 
The following table summarizes restricted stock activity for the nine months ended September 30, 2019:
 
 
Restricted
Stock
 
Weighted
Average Grant
Date Fair Value
Restricted stock outstanding at December 31, 2018
 
406,544

 
$
82.10

Granted
 
227,745

 
97.68

Vested
 
(11,217
)
 
133.43

Forfeited
 
(22,035
)
 
75.26

Restricted stock outstanding at September 30, 2019
 
601,037

 
$
87.30


 
Compensation costs related to restricted stock awards were $3.0 million and $7.7 million for the three and nine months ended September 30, 2019, respectively, of which $0.3 million and $0.9 million were capitalized to development projects, respectively. Compensation costs related to restricted stock awards were $2.2 million and $6.3 million for the three and nine months ended September 30, 2018, respectively, of which $0.1 million and $0.7 million were capitalized to development projects, respectively.