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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
3 Months Ended
Mar. 31, 2020
$ / shares
shares
No. of Stock Units  
Stock and stock units, beginning of period (in shares) | shares 784
Changes during the period:  
Granted (in shares) | shares 0
Vested and settled (in shares) | shares (2)
Cancelled (in shares) | shares (17)
Stock and stock units, end of period (in shares) | shares 765
Weighted Average Fair Value  
Stock and stock units, beginning of period (in dollars per share) | $ / shares $ 17.35
Changes during the period:  
Granted (in dollars per share) | $ / shares 0.00
Vested and settled (in dollars per share) | $ / shares 18.25
Cancelled (in dollars per share) | $ / shares 17.00
Stock and stock units, end of period (in dollars per share) | $ / shares $ 17.35