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CAPITAL STOCK AND STOCK AWARD PLANS (Tables) | 12 Months Ended
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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):
| 2021 |  | 2020 |  | 2019
Stock options | $ | 16,128 |  |  | $ | 20,162 |  |  | $ | 16,073 |
Stock awards | 110,701 |  |  | 20,985 |  |  | 20,170 |
Company expense on ESPP discount | 3,148 |  |  | 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.
| Options |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value (in thousands) |  | Average Remaining Life (years)
Outstanding at December 31, 2020 | 7,260,840 |  |  | $ | 76.37 |  |  | $ | 127,065 |  |  | 6.6
Exercised | (748,198) |  |  | 71.95 |  |  |  |  |
Forfeitures | (18,778) |  |  | 76.03 |  |  |  |  |
Outstanding at December 31, 2021 | 6,493,864 |  |  | $ | 76.88 |  |  | $ | 199,682 |  |  | 5.8
Vested at December 31, 2021 | 4,789,677 |  |  | $ | 76.08 |  |  |  |  | 5.2
Exercisable at December 31, 2021 | 4,789,677 |  |  | $ | 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 |
2020 | 38,551 |
2019 | 15,862 |
Schedule of Unvested Stock Option Grants | The following table summarizes these unvested stock option grants as of December 31, 2021:
First Vesting Date |  | Last Vesting Date |  | Options Granted, Net of Forfeitures |  | Weighted Average Grant Date Fair Value(1) |  | Unvested Options
December 31, 2018 |  | December 31, 2022 |  | 1,441,636 |  |  | $ | 14.25 |  |  | 276,353 |
December 31, 2019 |  | December 31, 2023 |  | 1,154,019 |  |  | 20.12 |  |  | 451,674 |
December 31, 2020 |  | December 31, 2024 |  | 1,638,791 |  |  | 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 Grants |  | 2019 Grants
Weighted-average risk-free interest rate | 1.6% |  | 2.1%
Expected dividend yield | 2.5% |  | 2.0%
Weighted-average volatility | 23% |  | 25%
Expected term (in years) | 8.91 |  | 6.08
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 Units |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2020 | 1,102,211 |  |  | $ | 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, 2021 | 407,642 |  |  | $ | 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 Date |  | Last Vesting Date |  | Performance Shares and Stock Units Granted, Net of Forfeitures |  | Weighted Average Grant Date Fair Value (1) |  | Unvested Performance Shares and Restricted Stock Units
December 31, 2019 |  | December 31, 2023 |  | 354,005 |  |  | $ | 73.79 |  |  | 70,756 |
December 31, 2020 |  | December 31, 2024 |  | 401,548 |  |  | 59.34 |  |  | 80,268 |
December 31, 2021 |  | December 31, 2025 |  | 285,765 |  |  | 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, 2020 | 598,039 |  |  | $ | 60.24 |
Granted | 666,311 |  |  | 72.09 |
Vested | (439,695) |  |  | 69.29 |
Forfeitures | (61,174) |  |  | 68.12 |
Unvested at December 31, 2021 | 763,481 |  |  | $ | 69.42 |
Schedule of Fair Value Stock Awards Vested | A summary of the fair value of stock awards vested (in thousands):
2021 | $ | 110,701 |
2020 | 20,985 |
2019 | 20,170 |
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
2021 | 220,970 |  |  | $ | 17,838 |  |  | $ | 3,148 |
2020 | 236,062 |  |  | 16,146 |  |  | 2,848 |
2019 | 224,596 |  |  | 16,093 |  |  | 2,840 |
Schedule of Share Repurchase Program Activity | The activity under these authorizations is as follows (dollar amounts in thousands):
| Shares Repurchased |  | Total Value of Shares Repurchased
2019 Repurchases | 3,434,102 |  |  | $ | 306,444 |
2020 Repurchases | 2,542,915 |  |  | 182,745 |
2021 Repurchases | 6,154,364 |  |  | 580,818 |

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