EARNINGS PER SHARE - Anti-Dilutive Stock Options (Details) - shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock options
Earnings per share [line items]
Stock options that were anti-dilutive and not included in diluted earnings per share calculations (in shares)	612,601	505,812	242,918

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

No definition available.

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