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STOCK-BASED COMPENSATION - Combined Restricted Stock Units Activity (Details) - RSUs - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Nonvested, beginning of period (shares)	2,565
Granted (shares)	1,168
Vested (shares)	(1,059)
Forfeited (shares)	(212)
Nonvested, end of period (shares)	2,462	2,565
Expected to vest (shares)	1,841
Weighted- Average Grant-Date Fair Value
Nonvested, beginning of period (dollars per share)	$ 55.61
Granted (dollars per share)	93.68	$ 66.21	$ 58.52
Vested (dollars per share)	51.11
Forfeited (dollars per share)	65.17
Nonvested, end of period (dollars per share)	74.78	$ 55.61
Expected to vest (dollars per share)	$ 76.05
Aggregate Intrinsic Value
Nonvested	$ 328,023
Expected to vest	$ 245,339

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Intrinsic value of equity-based compensation awards expected to vest. Excludes stock and unit options.

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Number of equity-based compensation awards expected to vest. Excludes stock and unit options.

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Weighted average grant date fair value of equity-based compensation awards expected to vest. Excludes stock and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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