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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of stock option activity
A summary of the transactions within the Company’s stock option plans follows (shares in thousands):  
SharesWeighted-Average
Exercise Price
Outstanding at December 31, 20225 80.45 
Granted— — 
Exercised(2)80.94 
Canceled— — 
Outstanding at December 31, 20233 80.17 
Exercisable at December 31, 20233 $80.17 
The following table presents information associated with stock options as of December 31, 2023 and 2022, and for the years ended December 31, 2023, 2022 and 2021. No stock options were granted during any of the years presented below.
202320222021
Intrinsic value of options outstanding as of December 31$2 $1 
Intrinsic value of options exercisable as of December 312 1 
Intrinsic value of options exercised1 — 1 
Summary of restricted stock units activity
A summary of RSUs granted follows (RSUs in thousands):
Year Ended December 31,  
202320222021
RSUs granted179 553 348 
Weighted-average grant date price per unit$461.37 $309.39 $297.02 
A summary of RSU activity for the year ended December 31, 2023 follows (RSUs in thousands):  
Stock UnitsWeighted-Average
Grant Date Fair Value
Nonvested as of December 31, 2022464 $215.23 
Granted179 461.37 
Vested(319)297.27 
Forfeited(36)353.26 
Nonvested as of December 31, 2023288 $360.41