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EARNINGS PER SHARE - Antidilutive Securities (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share, Diluted, Other Disclosures [Abstract]        
Antidilutive shares excluded from calculation of earnings per share 79,459 164,487 90,783 149,441