EQUITY-BASED COMPENSATION - Stock Appreciation Rights (Details)	12 Months Ended
Dec. 31, 2019 $ / shares shares
Restricted Stock Awards & Units
Outstanding at December 31, 2018 (in shares) \| shares	332,387
Exercised (in shares) \| shares	(116,044)
Outstanding at December 31, 2019 (in shares) \| shares	216,343
Weighted Average Exercise Price
Outstanding at December 31, 2018 (in dollars per share) \| $ / shares	$ 95.04
Exercised (in dollars per share) \| $ / shares	82.29
Outstanding at December 31, 2019 (in dollars per share) \| $ / shares	$ 89.90
Stock Appreciation Rights (SARs) \| Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period	3 years
Restricted Stock Awards & Units
Outstanding at December 31, 2018 (in shares) \| shares	57,721
Exercised (in shares) \| shares	(11,399)
Expired (in shares) \| shares	(3,775)
Outstanding at December 31, 2019 (in shares) \| shares	42,547
Weighted Average Exercise Price
Outstanding at December 31, 2018 (in dollars per share) \| $ / shares	$ 22.12
Exercised (in dollars per share) \| $ / shares	70.69
Expired (in dollars per share) \| $ / shares	96.91
Outstanding at December 31, 2019 (in dollars per share) \| $ / shares	$ 90.89

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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

+ References

No definition available.

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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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- Definition

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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No definition available.

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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

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- Definition

Weighted average price of options that were either forfeited or expired.

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- Definition

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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- Definition

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

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- Definition

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

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No definition available.

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- Definition

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

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