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SHARE-BASED COMPENSATION - Summary of Transactions Involving Stock Units and Director Stock Grants (Details) - Stock and stock units
shares in Thousands
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Changes during the period:  
Stock and stock units, beginning of period (in shares) | shares 854
Granted (in shares) | shares 86
Vested and settled (in shares) | shares (87)
Forfeited and cancelled (in shares) | shares (31)
Stock and stock units, end of period (in shares) | shares 822
Changes during the period:  
Stock and stock units, beginning of period (in dollars per share) | $ / shares $ 12.55
Granted (in dollars per share) | $ / shares 8.12
Vested and settled (in dollars per share) | $ / shares 8.21
Forfeited and cancelled (in dollars per share) | $ / shares 12.56
Stock and stock units, end of period (in dollars per share) | $ / shares $ 12.44