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CAPITAL STOCK AND STOCK AWARD PLANS (Tables)
 12 Months Ended
Dec. 31, 2020
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):
202020192018
Stock options$20,162 $16,073 $23,374 
Stock awards20,985 20,170 61,826 
Company expense on ESPP discount2,848 2,840 2,591 
Total stock-based compensation expense$43,995 $39,083 $87,791 
Schedule of Stock Option Activity
The following schedule summarizes stock option activity in the plans. All outstanding unvested options as of December 31, 2020, relate to time-based grants from 2015 through 2019.
OptionsWeighted
Average
Exercise
Price		Aggregate
Intrinsic
Value
(in thousands)		Average
Remaining
Life
(years)
Outstanding at December 31, 20197,050,192 $75.40 $44,067 6.4
Grants1,661,196 72.74 
Exercised(1,420,655)67.29 
Forfeitures(29,893)77.59 
Outstanding at December 31, 20207,260,840 $76.37 $127,065 6.6
Vested at December 31, 20204,469,665 $74.29 5.6
Exercisable at December 31, 20204,469,665 $74.29 5.6
Schedule of Intrinsic Value of Options Exercised
Information on the intrinsic value of options exercised is as follows (in thousands):
2020$38,551 
201915,862 
201816,209 
Schedule of Unvested Stock Option Grants
The following table summarizes these unvested stock option grants as of December 31, 2020:
First Vesting DateLast Vesting DateOptions
Granted, Net of
Forfeitures		Weighted
Average Grant
Date Fair Value		Unvested Options
December 31, 2017December 31, 20211,236,538 $12.59 236,978 
December 31, 2018December 31, 20221,442,952 14.24 557,792 
December 31, 2019December 31, 20231,155,361 20.11 682,789 
December 31, 2020December 31, 20241,644,977 13.86 1,313,616 
5,479,828 $14.99 2,791,175 
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 Grants2018 Grants
Weighted-average risk-free interest rate1.6%2.1%3.1%
Expected dividend yield2.5%2.0%2.0%
Weighted-average volatility23%25%25%
Expected term (in years)8.916.086.08
Weighted average fair value per option$13.88 $17.52 $20.52 
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, 2020: 
Number of Restricted Shares and Restricted Stock UnitsWeighted Average
Grant Date Fair Value
Unvested at December 31, 2019841,793 $68.68 
Granted405,915 59.34 
Vested— — 
Forfeitures(145,497)52.70 
Unvested at December 31, 20201,102,211 $67.29 
The following table summarizes 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, 2017December 31, 2021336,217 $64.91 159,246 
December 31, 2018December 31, 2022308,748 74.26 174,300 
December 31, 2019December 31, 2023364,241 73.81 364,241 
December 31, 2020December 31, 2024404,424 59.34 404,424 
1,413,630 $67.65 1,102,211 
________________________________ 
(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, 2020: 
Number of Restricted
Shares and Stock Units		Weighted Average
Grant Date Fair Value
Unvested at December 31, 2019614,441 $68.76 
Granted337,828 59.26 
Vested(304,334)63.69 
Forfeitures(49,896)65.67 
Unvested at December 31, 2020598,039 $60.24 
Schedule of Fair Value Stock Awards Vested
A summary of the fair value of stock awards vested (in thousands): 
2020$20,985 
201920,170 
201861,826 
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
2020236,062 $16,146 $2,848 
2019224,596 16,093 2,840 
2018191,823 14,682 2,591 
Schedule of Share Repurchase Program Activity The activity under these authorizations is as follows (dollar amounts in thousands):
Shares RepurchasedTotal Value of Shares
Repurchased
2018 Repurchases3,319,077 $303,492 
2019 Repurchases3,434,102 306,444 
2020 Repurchases2,542,915 182,745