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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2023
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 stock-based payments recognized in the three and six months ended June 30, 2023 and 2022 (in thousands):
 
 Three Months Ended
June 30,		Six Months Ended
June 30,
 2023202220232022
Stock options$4,611 $18,287 $13,561 $36,125 
Restricted stock30,137 15,730 47,283 30,523 
Stock-based compensation$34,748 $34,017 $60,844 $66,648 
The tax benefits recorded on stock-based compensation and upon the exercises of options were $6.3 million and $20.0 million for the six months ended June 30, 2023 and 2022, respectively.
The following table summarizes the Company’s total unrecognized compensation cost related to stock based compensation as of June 30, 2023 (cost in thousands):
Unrecognized
Compensation
Cost		Weighted Average
Period of Expense
Recognition
(in Years)
Stock options$42,202 2.48
Restricted stock90,600 0.92
Total$132,802 
Stock Options
The following summarizes the changes in the number of shares of common stock under option for the six months ended June 30, 2023 (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, 20225,301 $188.12 3,512 $159.46 $113,681 
Granted186 203.36 $67.47 
Exercised(401)158.02 $22,968 
Forfeited(77)242.12 
Outstanding at June 30, 20235,009 $190.27 3,383 $164.87 $316,912 
Expected to vest as of June 30, 2023775 $223.27 
The aggregate intrinsic value of stock options exercisable at June 30, 2023 was $293.7 million. The weighted average remaining contractual term of options exercisable at June 30, 2023 was 3.6 years.
Restricted Stock
The following table summarizes the changes in the number of shares of restricted stock awards and restricted stock units for the six months ended June 30, 2023 (shares in thousands):
 
SharesWeighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2022435 $237.68 
Granted438 213.09 
Issued(251)239.09 
Cancelled(17)234.49 
Outstanding at June 30, 2023605 $219.39