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CAPITAL STOCK AND STOCK AWARD PLANS (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Expense A summary expense recognized within personnel expenses in our consolidated statements of operations and comprehensive income for stock-based compensation is as follows (in thousands):
202320222021
Stock options$8,929 $13,025 $16,128 
Stock awards45,878 74,186 110,701 
Company expense on ESPP discount3,362 3,466 3,148 
Total stock-based compensation expense$58,169 $90,677 $129,977 
Schedule of Stock Option Activity
The following schedule summarizes stock option activity in the plans. All outstanding unvested options as of December 31, 2023, relate to time-based grants from 2020.
OptionsWeighted
Average
Exercise
Price		Aggregate
Intrinsic
Value
(in thousands)		Average
Remaining
Life
(years)
Outstanding as of December 31, 20225,358,796 $77.93 $73,065 5.1
Exercised(560,433)70.21 
Forfeitures(7,466)75.72 
Outstanding as of December 31, 20234,790,897 $78.83 $39,138 4.3
Vested as of December 31, 20234,475,465 $79.26 4.2
Exercisable as of December 31, 20234,475,465 $79.26 4.2
Schedule of Intrinsic Value of Options Exercised
Information on the intrinsic value of options exercised is as follows (in thousands):
2023$14,442 
202243,353 
202120,427 
Schedule of Unvested Stock Option Grants
The following table summarizes these unvested stock option grants as of December 31, 2023:
First Vesting DateLast Vesting DateOptions
Granted, Net of
Forfeitures
Weighted
Average Grant
Date Fair Value(1)
Unvested Options
December 31, 2020December 31, 20241,626,101 13.87 315,432 
________________________________ 
(1) Amount shown is the weighted average grant date fair value of options granted, net of forfeitures.
Schedule of Option Pricing Model Valuation Assumptions
The grant date fair value per option was estimated using the Black-Scholes option pricing model with the following assumptions: 
2020 Grants
Weighted-average risk-free interest rate1.6%
Expected dividend yield2.5%
Weighted-average volatility23%
Expected term (in years)8.91
Weighted average fair value per option$13.88 
Schedule of Performance Based Restricted Shares and Restricted Stock Units
The following table summarizes activity related to our performance-based restricted shares and PSUs as of December 31, 2023:
Number of Restricted Shares and Restricted Stock UnitsWeighted Average
Grant Date Fair Value
Unvested as of December 31, 2022517,808 $76.89 
Granted(1)
423,677 92.14 
Forfeitures(369,158)80.68 
Unvested as of December 31, 2023572,327 $86.69 
________________________________ 
(1) Amount represents PSU grants at target.
The following table summarizes PSUs by vesting period at target: 
First Vesting DateLast Vesting DatePerformance Shares and Stock Units
Granted, Net of
Forfeitures
Weighted
Average Grant
Date Fair Value (1)
Unvested Performance Shares and Restricted Stock Units
December 31, 2022December 31, 2024279,815 $76.63 220,500 
December 31, 2023December 31, 2025409,401 92.13 351,827 
689,216 $85.84 572,327 
________________________________ 
(1) Amount shown is the weighted average grant date fair value of PSUs granted, net of forfeitures.
Schedule of Unvested Time-Based Restricted Share and Restricted Stock Unit Grants
The following table summarizes our unvested time-based restricted share and restricted stock unit grants as of December 31, 2023: 
Number of Restricted
Shares and Stock Units		Weighted Average
Grant Date Fair Value
Unvested as of December 31, 2022889,412 $74.26 
Granted938,690 91.97 
Vested(694,056)77.61 
Forfeitures(114,770)82.60 
Unvested as of December 31, 20231,019,276 $87.36 
Schedule of Fair Value Stock Awards Vested
A summary of the fair value of stock awards vested (in thousands): 
2023$53,868 
202274,186 
2021110,701 
Schedule of Employee Stock Purchase Plan Activity The following is a summary of the employee stock purchase plan activity (dollar amounts in thousands): 
Shares Purchased
By Employees		Aggregate Cost
to Employees		Expense Recognized
By the Company
2023240,418 $19,051 $3,362 
2022229,705 19,643 3,466 
2021220,970 17,838 3,148 
Schedule of Share Repurchase Program Activity The activity under these authorizations is as follows (dollar amounts in thousands):
Shares RepurchasedTotal Value of Shares
Repurchased
2023 Repurchases645,753 $62,778 
2022 Repurchases14,226,190 1,456,713 
2021 Repurchases6,154,364 580,818