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STOCK-BASED COMPENSATION - Equity Instruments Other Than Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Unvested, January 1, 2019	92,381
Number of Shares, Granted	58,549
Number of Shares, Vested	(49,635)
Number of Shares, Forfeited	(2,485)
Number of Shares, Unvested, December 31, 2019	98,810	92,381
Weighted-Average Grant-Date Fair Value, Unvested, January 1, 2019	$ 97.56
Weighted-Average Grant-Date Fair Value, Granted	168.95	$ 115.48	$ 116.58
Weighted-Average Grant-Date Fair Value, Vested	87.96
Weighted-Average Grant-Date Fair Value, Forfeited	103.79
Weighted-Average Grant-Date Fair Value, Unvested, December 31, 2019	$ 144.53	$ 97.56
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Unvested, January 1, 2019	409,949
Number of Shares, Granted	73,640
Number of Shares, Vested	(171,946)
Number of Shares, Unvested, December 31, 2019	311,643	409,949
Weighted-Average Grant-Date Fair Value, Unvested, January 1, 2019	$ 46.74
Weighted-Average Grant-Date Fair Value, Granted	194.19	$ 122.15	83.25
Weighted-Average Grant-Date Fair Value, Vested	47.89
Weighted-Average Grant-Date Fair Value, Unvested, December 31, 2019	$ 80.94	$ 46.74
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Unvested, January 1, 2019	52,730
Number of Shares, Granted	25,746
Number of Shares, Vested	(40,695)
Number of Shares, Unvested, December 31, 2019	37,781	52,730
Weighted-Average Grant-Date Fair Value, Unvested, January 1, 2019	$ 86.43
Weighted-Average Grant-Date Fair Value, Granted	198.72	$ 119.62	$ 105.65
Weighted-Average Grant-Date Fair Value, Vested	59.09
Weighted-Average Grant-Date Fair Value, Unvested, December 31, 2019	$ 134.97	$ 86.43

X

- Definition

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

+ 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)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Per share or unit weighted-average intrinsic value of award forfeited under share-based payment arrangement. Excludes share and unit options.

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- Definition

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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-Publisher FASB
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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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Per share or unit weighted-average intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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