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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, 2019
$ / shares
shares
No. of Stock Units  
Balance at beginning of period | shares 856
Changes during the period:  
Granted | shares 45
Vested and settled | shares (63)
Cancelled | shares (33)
Balance at end of period | shares 805
Weighted Average Fair Value  
Balance at beginning of period (in usd per share) | $ / shares $ 18.79
Changes during the period:  
Granted | $ / shares 15.58
Vested and settled | $ / shares 17.94
Cancelled | $ / shares 19.30
Balance at end of period (in usd per share) | $ / shares $ 18.66