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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, 2018
$ / shares
shares
No. of Stock Units  
Balance at beginning of period | shares 854
Changes during the period:  
Granted | shares 5
Vested and settled | shares (33)
Cancelled | shares (2)
Balance at end of period | shares 824
Weighted Average Fair Value  
Balance at beginning of period (in usd per share) | $ / shares $ 21.42
Changes during the period:  
Granted | $ / shares 16.68
Vested and settled | $ / shares 20.05
Cancelled | $ / shares 21.26
Balance at end of period (in usd per share) | $ / shares $ 21.38