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SHARE-BASED COMPENSATION PLAN - Measurement assumptions (Details)	12 Months Ended
	Dec. 31, 2019 item
SHARE-BASED COMPENSATION PLAN
Number of observations of returns	745
PSO | Minimum
SHARE-BASED COMPENSATION PLAN
Total shareholder return	75.00%
PSO | Maximum
SHARE-BASED COMPENSATION PLAN
Total shareholder return	125.00%

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- Definition

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.

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- Definition

The number of observations of returns used as standard deviation in the calculation of volatility.

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- Definition

A measurement of performance of the Company's stock, expressed as a percentage.

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