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STOCK-BASED COMPENSATION - Schedules - Stock Options (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Aggregate Intrinsic Value |  |  |
Share price (in dollars per share) | $ 273.79 |  |
Stock Options |  |  |
Number of Options |  |  |
Outstanding at the beginning of the period (in shares) | 777,871 |  |
Granted (in shares) | 203,582 |  |
Exercised (in shares) | (47,630) |  |
Forfeited (in shares) | (5,396) |  |
Expired (in shares) | (3,717) |  |
Outstanding at the end of the period (in shares) | 924,710 | 777,871 |
Options exercisable at the end of the period (in shares) | 663,239 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 69.87 |  |
Granted (in dollars per share) | 290.27 |  |
Exercised (in dollars per share) | 161.25 |  |
Forfeited (in dollars per share) | 285.56 |  |
Expired (in dollars per share) | 221.99 |  |
Outstanding at the end of the period (in dollars per share) | 111.82 | $ 69.87 |
Options exercisable at the end of the period (in dollars per share) | $ 44.49 |  |
Weighted Average Remaining Contractual Term |  |  |
Outstanding at the end of the period | 4 years 5 months 19 days |  |
Options exercisable at the end of the period | 2 years 7 months 17 days |  |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of the period | $ 155,411,000 |  |
Options exercisable at the end of the period | $ 153,243,000 |  |
Weighted average assumptions |  |  |
Dividend yield | 0.00% | 0.00% | 0.00%
Expected volatility, minimum | 52.00% | 51.00% | 50.00%
Expected volatility, maximum | 60.00% | 55.00% | 53.00%
Risk-free interest rate, minimum | 0.33% | 1.46% | 2.33%
Risk-free interest rate, maximum | 0.96% | 2.55% | 3.06%
Performance Options |  |  |
Number of Options |  |  |
Outstanding at the beginning of the period (in shares) | 463,440 |  |
Granted (in shares) | 236,769 |  |
Exercised (in shares) | 0 |  |
Forfeited (in shares) | 0 |  |
Expired (in shares) | 0 |  |
Outstanding at the end of the period (in shares) | 700,209 | 463,440 |
Options exercisable at the end of the period (in shares) | 0 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 204.31 |  |
Granted (in dollars per share) | 298.05 |  |
Exercised (in dollars per share) | 0 |  |
Forfeited (in dollars per share) | 0 |  |
Expired (in dollars per share) | 0 |  |
Outstanding at the end of the period (in dollars per share) | 236.01 | $ 204.31 |
Options exercisable at the end of the period (in dollars per share) | $ 0 |  |
Weighted Average Remaining Contractual Term |  |  |
Outstanding at the end of the period | 7 years 9 months |  |
Options exercisable at the end of the period | 0 years |  |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of the period | $ 36,238,000 |  |
Options exercisable at the end of the period | $ 0 |  |
Weighted average assumptions |  |  |
Expected term | 7 years | 7 years |
Dividend yield | 0.00% | 0.00% | 0.00%
Expected volatility, minimum | 51.00% | 51.00% | 50.00%
Expected volatility, maximum | 51.00% | 51.00% | 50.00%
Risk-free interest rate, minimum | 1.03% | 2.54% | 2.38%
Risk-free interest rate, maximum | 1.03% | 2.54% | 2.81%
Dividends | $ 0 | $ 0 | $ 0
Minimum | Stock Options |  |  |
Weighted average assumptions |  |  |
Expected term | 5 years | 5 years | 5 years
Minimum | Performance Options |  |  |
Weighted average assumptions |  |  |
Expected term |  |  | 7 years
Maximum | Stock Options |  |  |
Weighted average assumptions |  |  |
Expected term | 6 years 3 months | 6 years 3 months | 6 years 8 months 15 days
Maximum | Performance Options |  |  |
Weighted average assumptions |  |  |
Expected term |  |  | 7 years 1 month 24 days

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- Definition The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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