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Stock-Based Compensation
3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
The following table summarizes the expense recognized within general and administrative expenses in the Unaudited Consolidated Statements of Income related to share-based payments recognized in the three months ended March 31 (in thousands):
 
 Three Months Ended
March 31,
 20222021
Stock options$17,837 $4,590 
Restricted stock14,794 13,157 
Stock-based compensation$32,631 $17,747 
The tax benefits recorded on stock-based compensation and upon the exercises of options were $17.8 million and $14.1 million for the three months ended March 31, 2022 and 2021, respectively.
The following table summarizes the Company’s total unrecognized compensation cost related to stock based compensation as of March 31, 2022 (cost in thousands):
Unrecognized
Compensation
Cost
Weighted Average
Period of Expense
Recognition
(in Years)
Stock options$100,898 2.00
Restricted stock83,266 1.35
Total$184,164 

Stock Options
The following summarizes the changes in the number of shares of common stock under option for the three months ended March 31, 2022 (shares/options and aggregate intrinsic value in thousands):
SharesWeighted
Average
Exercise
Price
Options
Exercisable
at End of
Period
Weighted
Average
Exercise
Price of
Exercisable
Options
Weighted
Average Fair
Value of
Options
Granted 
During the Period
Aggregate
Intrinsic
Value
Outstanding at December 31, 20215,447 $176.52 3,798 $145.18 $257,707 
Granted588 226.36 $65.66 
Exercised(119)68.38 20,523 
Forfeited(4)252.50 
Outstanding at March 31, 20225,912 $183.61 3,805 $150.28 $403,008 
Expected to vest as of March 31, 20222,107 $243.79 
The aggregate intrinsic value of stock options exercisable at March 31, 2022 was $377.4 million. The weighted average remaining contractual term of options exercisable at March 31, 2022 was 4.3 years.
Restricted Stock
The following table summarizes the changes in the number of shares of restricted stock and restricted stock units for the three months ended March 31, 2022 (shares in thousands):
 
SharesWeighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2021278 $278.57 
Granted324 223.00 
Vested(117)270.93 
Canceled or forfeited(33)348.85 
Outstanding at March 31, 2022452 $235.48