STOCKHOLDERS' EQUITY - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of year (in shares)	858	951	887
Granted (in shares)	129	174	197
Exercised (in shares)	(109)	(256)	(112)
Forfeited (in shares)	(10)	(11)	(17)
Cancelled (in shares)	(1)	0	(4)
Outstanding at end of year (in shares)	867	858	951
Exercisable at end of year (in shares)	538	494	581
Weighted Average Exercise Price [Abstract]
Outstanding at beginning of year (in dollars per share)	$ 80.58	$ 68.18	$ 61.59
Granted (in dollars per share)	119.12	111.75	85.13
Exercised (in dollars per share)	63.42	55.26	43.67
Forfeited (in dollars per share)	106.93	92.94	80.88
Cancelled (in dollars per share)	74.57	0	70.90
Outstanding at end of year (in dollars per share)	88.19	80.58	68.18
Exercisable at end of period (in dollars per share)	$ 75.51	$ 69.04	$ 59.29
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Aggregate intrinsic value for outstanding stock options	$ 69,711	$ 29,735	$ 31,814
Weighted average remaining contractual term for outstanding stock options	6 years 4 months 24 days
Aggregate intrinsic value for exercisable stock options outstanding	$ 50,128
Weighted average remaining contractual term for exercisable stock options outstanding	5 years 3 months 18 days
Weighted-average fair value of options granted (in dollars per share)	$ 33.11	$ 24.36	$ 18.51
Total intrinsic value of stock options exercised	$ 7,866	$ 12,698	$ 6,135

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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