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CAPITAL STOCK AND STOCK AWARD PLANS (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Stock-Based Compensation Expense | A summary of our total compensation expense recognized within personnel expenses in our consolidated statements of operations and comprehensive income for stock-based compensation is as follows (in thousands):
| 2019 |  | 2018 |  | 2017
Stock options | $ | 16,073 |  |  | $ | 23,374 |  |  | $ | 10,109 |
Stock awards | 20,170 |  |  | 61,826 |  |  | 29,217 |
Company expense on ESPP discount | 2,840 |  |  | 2,591 |  |  | 2,479 |
Total stock-based compensation expense | $ | 39,083 |  |  | $ | 87,791 |  |  | $ | 41,805 |
Schedule of Stock Option Activity | The following schedule summarizes stock option activity in the plans. All outstanding unvested options as of December 31, 2019, relate to time-based grants from 2015 through 2019.
| Options |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value (in thousands) |  | Average Remaining Life (years)
Outstanding at December 31, 2018 | 7,822,514 |  |  | $ | 74.42 |  |  | $ | 85,222 |  |  | 7.2
Grants | 151,040 |  |  | 82.46 |  |  |  |  |
Exercised | (725,685) |  |  | 65.58 |  |  |  |  |
Forfeitures | (197,677) |  |  | 77.87 |  |  |  |  |
Outstanding at December 31, 2019 | 7,050,192 |  |  | $ | 75.40 |  |  | $ | 44,067 |  |  | 6.4
Vested at December 31, 2019 | 4,507,070 |  |  | $ | 71.17 |  |  |  |  | 5.6
Exercisable at December 31, 2019 | 4,507,070 |  |  | $ | 71.17 |  |  |  |  | 5.6
Schedule of Intrinsic Value of Options Exercised | Information on the intrinsic value of options exercised is as follows (in thousands):
2019 | $ | 15,862 |
2018 | 16,209 |
2017 | 6,026 |
Schedule of Unvested Stock Option Grants | The following table summarizes these unvested stock option grants as of December 31, 2019:
First Vesting Date |  | Last Vesting Date |  | Options Granted, Net of Forfeitures |  | Weighted Average Grant Date Fair Value |  | Unvested Options |
December 31, 2016 |  | December 31, 2020 |  | 1,421,432 |  |  | $ | 12.66 |  |  | 280,033 |
December 31, 2017 |  | December 31, 2021 |  | 1,238,090 |  |  | 12.60 |  |  | 484,683 |
December 31, 2018 |  | December 31, 2022 |  | 1,447,294 |  |  | 14.25 |  |  | 855,028 |
December 31, 2019 |  | December 31, 2023 |  | 1,159,662 |  |  | 20.13 |  |  | 923,378 |
|  |  |  | 5,266,478 |  |  | $ | 14.73 |  |  | 2,543,122 |
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:
| 2019 Grants |  | 2018 Grants |  | 2017 Grants
Weighted-average risk-free interest rate | 2.1% |  |  | 3.1% |  |  | 2.3% |
Expected dividend yield | 2.0% |  |  | 2.0% |  |  | 2.5% |
Weighted-average volatility | 25% |  |  | 25% |  |  | 20% |
Expected term (in years) | 6.08 |  | 6.08 |  | 6.20
Weighted average fair value per option | $ | 17.52 |  |  | $ | 20.52 |  |  | $ | 14.23 |
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, 2019:
| Number of Restricted Shares and Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2018 | 846,170 |  |  | $ | 68.35 |
Granted | 38,340 |  |  | 68.10 |
Vested | — |  |  | — |
Forfeitures | (42,717) |  |  | 63.24 |
Unvested at December 31, 2019 | 841,793 |  |  | $ | 68.68 |
The following table summarizes 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, 2016 |  | December 31, 2020 |  | 388,578 |  |  | $ | 51.88 |  |  | 138,268 |
December 31, 2017 |  | December 31, 2021 |  | 338,693 |  |  | 64.91 |  |  | 161,722 |
December 31, 2018 |  | December 31, 2022 |  | 310,713 |  |  | 74.26 |  |  | 176,265 |
December 31, 2019 |  | December 31, 2023 |  | 365,538 |  |  | 73.82 |  |  | 365,538 |
|  |  |  | 1,403,522 |  |  | $ | 65.59 |  |  | 841,793 |
________________________________ (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, 2019:
| Number of Restricted Shares and Stock Units |  | Weighted Average Grant Date Fair Value
Unvested at December 31, 2018 | 926,692 |  |  | $ | 67.08 |
Granted | 40,309 |  |  | 72.07 |
Vested | (291,318) |  |  | 63.93 |
Forfeitures | (61,242) |  |  | 67.66 |
Unvested at December 31, 2019 | 614,441 |  |  | $ | 68.76 |
Schedule of Fair Value Stock Awards Vested | A summary of the fair value of stock awards vested (in thousands):
2019 | $ | 20,170 |
2018 | 61,826 |
2017 | 29,217 |
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
2019 | 224,596 |  |  | $ | 16,093 |  |  | $ | 2,840 |
2018 | 191,823 |  |  | 14,682 |  |  | 2,591 |
2017 | 215,613 |  |  | 14,048 |  |  | 2,479 |
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
2017 Repurchases | 2,426,407 |  |  | $ | 179,985 |
2018 Repurchases | 3,319,077 |  |  | 303,492 |
2019 Repurchases | 3,434,102 |  |  | 306,444 |

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