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EARNINGS PER SHARE - Narrative (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Stock options and time-vesting RSUs        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares excluded from the calculation of earnings per share (in shares) 1,133,597 4,225,888 982,940 3,530,837