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CAPITAL STOCK AND STOCK AWARD PLANS (Tables)
 12 Months Ended
Dec. 31, 2021
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):
202120202019
Stock options$16,128 $20,162 $16,073 
Stock awards110,701 20,985 20,170 
Company expense on ESPP discount3,148 2,848 2,840 
Total stock-based compensation expense$129,977 $43,995 $39,083 
Schedule of Stock Option Activity The following schedule summarizes stock option activity in the plans. All outstanding unvested options as of December 31, 2021, relate to time-based grants from 2015 through 2020.
OptionsWeighted
Average
Exercise
Price		Aggregate
Intrinsic
Value
(in thousands)		Average
Remaining
Life
(years)
Outstanding at December 31, 20207,260,840 $76.37 $127,065 6.6
Exercised(748,198)71.95 
Forfeitures(18,778)76.03 
Outstanding at December 31, 20216,493,864 $76.88 $199,682 5.8
Vested at December 31, 20214,789,677 $76.08 5.2
Exercisable at December 31, 20214,789,677 $76.08 5.2
Schedule of Intrinsic Value of Options Exercised Information on the intrinsic value of options exercised is as follows (in thousands):
2021$20,427 
202038,551 
201915,862 
Schedule of Unvested Stock Option Grants
The following table summarizes these unvested stock option grants as of December 31, 2021:
First Vesting DateLast Vesting DateOptions
Granted, Net of
Forfeitures
Weighted
Average Grant
Date Fair Value(1)
Unvested Options
December 31, 2018December 31, 20221,441,636 $14.25 276,353 
December 31, 2019December 31, 20231,154,019 20.12 451,674 
December 31, 2020December 31, 20241,638,791 13.87 976,160 
4,234,446 $15.70 1,704,187 
________________________________ 
(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 fair value per option was estimated using the Black-Scholes option pricing model with the following assumptions: 
2020 Grants2019 Grants
Weighted-average risk-free interest rate1.6%2.1%
Expected dividend yield2.5%2.0%
Weighted-average volatility23%25%
Expected term (in years)8.916.08
Weighted average fair value per option$13.88 $17.52 
Schedule of Performance Based Restricted Shares and Restricted Stock Units
The following table summarizes our unvested performance-based restricted shares and restricted stock unit grants as of December 31, 2021:
Number of Restricted Shares and Restricted Stock UnitsWeighted Average
Grant Date Fair Value
Unvested at December 31, 20201,102,211 $67.29 
Granted(1)
292,993 74.92 
Performance-based grant adjustment(2)
29,147 67.13 
Vested(980,188)67.37 
Forfeitures(36,521)71.10 
Unvested at December 31, 2021407,642 $72.21 
________________________________ 
(1) Amount represents performance-based restricted stock unit grants at target.
(2)Amount represents incremental shares issuable for achieving 200 percent upside upon meeting certain adjusted gross profit targets in 2021.
The following table summarizes unvested performance-based restricted shares and restricted stock units by vesting period: 
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, 2019December 31, 2023354,005 $73.79 70,756 
December 31, 2020December 31, 2024401,548 59.34 80,268 
December 31, 2021December 31, 2025285,765 74.91 256,618 
1,041,318 $68.53 407,642 
________________________________ 
(1) Amount shown is the weighted average grant date fair value of performance-based restricted shares and restricted stock units 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, 2021: 
Number of Restricted
Shares and Stock Units		Weighted Average
Grant Date Fair Value
Unvested at December 31, 2020598,039 $60.24 
Granted666,311 72.09 
Vested(439,695)69.29 
Forfeitures(61,174)68.12 
Unvested at December 31, 2021763,481 $69.42 
Schedule of Fair Value Stock Awards Vested
A summary of the fair value of stock awards vested (in thousands): 
2021$110,701 
202020,985 
201920,170 
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
2021220,970 $17,838 $3,148 
2020236,062 16,146 2,848 
2019224,596 16,093 2,840 
Schedule of Share Repurchase Program Activity The activity under these authorizations is as follows (dollar amounts in thousands):
Shares RepurchasedTotal Value of Shares
Repurchased
2019 Repurchases3,434,102 $306,444 
2020 Repurchases2,542,915 182,745 
2021 Repurchases6,154,364 580,818