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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
9 Months Ended
Sep. 30, 2019
$ / shares
shares
No. of Stock Units  
Stock and stock units, beginning of period (in shares) | shares 856
Changes during the period:  
Granted (in shares) | shares 45
Vested and settled (in shares) | shares (133)
Cancelled (in shares) | shares (54)
Stock and stock units, end of period (in shares) | shares 714
Weighted Average Fair Value  
Stock and stock units, beginning of period (in dollars per share) | $ / shares $ 18.79
Changes during the period:  
Granted (in dollars per share) | $ / shares 15.58
Vested and settled (in dollars per share) | $ / shares 15.55
Cancelled (in dollars per share) | $ / shares 18.75
Stock and stock units, end of period (in dollars per share) | $ / shares $ 19.19