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STOCK-BASED COMPENSATION - Summary of Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Weighted-Average Grant-Date Fair Value |  |  |
Proceeds from stock option exercises | $ 68,555 | $ 90,834 | $ 88,156
Stock options |  |  |
STOCK-BASED COMPENSATION |  |  |
Award vesting period (in years) | 3 years |  |
Weighted-Average Grant-Date Fair Value |  |  |
Actual tax benefit realized for the tax deduction from option exercises | $ 14,500 |  |
Unrecognized compensation cost expected to be recognized in future periods | $ 200 |  |
Weighted-average period over which compensation cost is expected to be recognized (in years) | 2 months 12 days |  |
Expiration period (in years) | 10 years |  |
Proceeds from stock option exercises | $ 68,600 |  |
Restricted stock units |  |  |
Weighted-Average Grant-Date Fair Value |  |  |
Actual tax benefit realized for the tax deduction from option exercises | 5,800 |  |
Unrecognized compensation cost expected to be recognized in future periods | $ 43,300 |  |
Weighted-average period over which compensation cost is expected to be recognized (in years) | 1 year 7 months 6 days |  |
Restricted stock units (time-based) |  |  |
Restricted stock unit activity |  |  |
Balance at the beginning of the period (in shares) | 480,729 |  |
Granted (in shares) | 241,812 |  |
Vested (in shares) | (138,606) |  |
Forfeited (in shares) | (7,737) |  |
Balance at the end of the period (in shares) | 576,198 | 480,729 |
Weighted-Average Grant-Date Fair Value |  |  |
Nonvested at the beginning of the period (in dollars per share) | $ 95.45 |  |
Granted (in dollars per share) | 87.13 |  |
Vested (in dollars per share) | 86.84 |  |
Forfeited (in dollars per share) | 97.80 |  |
Nonvested at the end of the period (in dollars per share) | $ 92.47 | $ 95.45 |
Restricted stock units (performance-based) |  |  |
Restricted stock unit activity |  |  |
Balance at the beginning of the period (in shares) | 181,680 |  |
Granted (in shares) | 417,313 |  |
Vested (in shares) | 0 |  |
Forfeited (in shares) | (8,929) |  |
Balance at the end of the period (in shares) | 590,064 | 181,680 |
Weighted-Average Grant-Date Fair Value |  |  |
Nonvested at the beginning of the period (in dollars per share) | $ 117.26 |  |
Granted (in dollars per share) | 93.08 |  |
Vested (in dollars per share) | 0 |  |
Forfeited (in dollars per share) | 111.60 |  |
Nonvested at the end of the period (in dollars per share) | $ 100.27 | $ 117.26 |
Stock Awards Plans | Stock options |  |  |
Assumptions used to estimate fair value of restricted stock units granted |  |  |
Expected stock price volatility |  |  | 14.20%
Risk-free interest rate |  |  | 2.80%
Dividend yield |  |  | 1.50%
Weighted-Average Grant-Date Fair Value |  |  |
Weighted-average fair value of stock options granted (in dollars per share) |  |  | $ 14.82
Assumptions used to estimate fair value of stock options granted |  |  |
Dividend yield |  |  | 1.50%
Expected stock price volatility |  |  | 14.20%
Risk-free interest rate |  |  | 2.80%
Expected life of option |  |  | 6 years 7 months 6 days
Stock options activity |  |  |
Outstanding at the beginning of the period (in shares) | 5,044,180 |  |
Granted (in shares) | 0 |  |
Exercised (in shares) | (1,035,649) |  |
Forfeited or expired (in shares) | (10,484) |  |
Outstanding at the end of the period (in shares) | 3,998,047 | 5,044,180 |
Exercisable at the end of the period (in shares) | 3,845,344 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 68.32 |  |
Granted (in dollars per share) | 0 |  |
Exercised (in dollars per share) | 60.81 |  |
Forfeited or expired (in dollars per share) | 80.13 |  |
Outstanding at the end of the period (in dollars per share) | 70.28 | $ 68.32 |
Exercisable at the end of the period (in dollars per share) | $ 69.45 |  |
Weighted-Average Remaining Contractual Term (Years): |  |  |
Outstanding at the end of the period | 4 years 9 months 18 days |  |
Exercisable at the end of the period | 4 years 7 months 6 days |  |
Aggregate Intrinsic Value: |  |  |
Outstanding at the end of the period | $ 256,760 |  |
Exercisable at the end of the period | 249,299 |  |
Intrinsic value of options exercised | $ 59,179 | $ 87,251 | $ 72,951
Stock Awards Plans | Restricted stock units (time-based) |  |  |
STOCK-BASED COMPENSATION |  |  |
Award vesting period (in years) | 3 years |  |
Stock Awards Plans | Restricted stock units (performance-based) |  |  |
STOCK-BASED COMPENSATION |  |  |
Award vesting period (in years) | 3 years |  |
Assumptions used to estimate fair value of restricted stock units granted |  |  |
Fair value per stock award (in dollars per share) | $ 94.98 | $ 134.97 | $ 128.70
Grant date stock price (in dollars per share) | $ 83.93 | $ 104.51 | $ 89.42
Expected stock price volatility | 23.80% | 16.50% | 12.30%
Expected average volatility of peer companies | 48.50% | 31.90% | 27.50%
Correlation assumption | 63.50% | 37.40% | 20.20%
Risk-free interest rate | 0.31% | 2.19% | 2.42%
Dividend yield | 1.72% | 1.30% | 1.43%
Assumptions used to estimate fair value of stock options granted |  |  |
Dividend yield | 1.72% | 1.30% | 1.43%
Expected stock price volatility | 23.80% | 16.50% | 12.30%
Risk-free interest rate | 0.31% | 2.19% | 2.42%
Director Stock Option Plans | Stock options |  |  |
Stock options activity |  |  |
Outstanding at the beginning of the period (in shares) | 135,251 |  |
Granted (in shares) | 0 |  |
Exercised (in shares) | (36,051) |  |
Forfeited or expired (in shares) | 0 |  |
Outstanding at the end of the period (in shares) | 99,200 | 135,251 |
Exercisable at the end of the period (in shares) | 99,200 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 58.45 |  |
Granted (in dollars per share) | 0 |  |
Exercised (in dollars per share) | 52.00 |  |
Forfeited or expired (in dollars per share) | 0 |  |
Outstanding at the end of the period (in dollars per share) | 60.80 | $ 58.45 |
Exercisable at the end of the period (in dollars per share) | $ 60.80 |  |
Weighted-Average Remaining Contractual Term (Years): |  |  |
Outstanding at the end of the period | 2 years 7 months 6 days |  |
Exercisable at the end of the period | 2 years 7 months 6 days |  |
Aggregate Intrinsic Value: |  |  |
Outstanding at the end of the period | $ 7,311 |  |
Exercisable at the end of the period | 7,311 |  |
Intrinsic value of options exercised | $ 2,318 | $ 1,172 | $ 2,286
Director Stock Option Plans | Restricted stock units |  |  |
STOCK-BASED COMPENSATION |  |  |
Award vesting period (in years) | 1 year |  |
Director Stock Option Plans | Restricted stock units (time-based) |  |  |
Restricted stock unit activity |  |  |
Granted (in shares) | 12,379 |  |
Vested (in shares) | (11,490) |  |

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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