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STOCK-BASED COMPENSATION, Summary of Activity for Non-vested Restricted Stock Unit Awards (Details) - Restricted Stock and RSU [Member] - $ / shares
shares in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Shares [Roll Forward]    
Balance, shares (in shares) 522 606
Granted, shares (in shares) 25 24
Forfeited (in shares) (11)  
Vested (in shares) (16) (19)
Balance, shares (in shares) 520 611
Weighted Average Share Price [Abstract]    
Balance, weighted average share price (in dollars per share) $ 7.11 $ 7.27
Granted, weighted average share price (in dollars per share) 3.88 4.78
Forfeited, weighted average share price (in dollars per share) 3.53  
Vested, weighted average share price (in dollars per share) 5.28 6.61
Balance, weighted average share price (in dollars per share) $ 7.08 $ 7.27