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STOCK-BASED COMPENSATION PLANS - Summary of restricted stock award activity (Details) - Restricted Stock [Member]
shares in Thousands
3 Months Ended
Mar. 31, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award  
Granted but not vested at beginning balance 268
Granted 65
Forfeited 66
Vested (49)
Granted but not vested at ending balance 218