SHARE-BASED COMPENSATION - Summary of Transactions Involving Performance Awards (Details) - Long-term performance stock units shares in Thousands	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Performance Units Subject to Market Conditions
Changes during the period:
Stock and stock units, beginning of period (in shares) | shares	489	[1]
Granted (in shares) | shares	0	[1]
Vested and settled (in shares) | shares	(89)	[1]
Forfeited and cancelled (in shares) | shares	(4)	[1]
Stock and stock units, end of period (in shares) | shares	396	[1]
Changes during the period:
Stock and stock units, beginning of period (in dollars per share) | $ / shares	$ 16.49
Granted (in dollars per share) | $ / shares	0
Vested and settled (in dollars per share) | $ / shares	17.54
Forfeited and cancelled (in dollars per share) | $ / shares	25.24
Stock and stock units, end of period (in dollars per share) | $ / shares	$ 16.16
Performance Units Not Subject to Market Conditions
Changes during the period:
Stock and stock units, beginning of period (in shares) | shares	209	[1]
Granted (in shares) | shares	0	[1]
Vested and settled (in shares) | shares	(65)	[1]
Forfeited and cancelled (in shares) | shares	(28)	[1]
Stock and stock units, end of period (in shares) | shares	116	[1]
Changes during the period:
Stock and stock units, beginning of period (in dollars per share) | $ / shares	$ 17.06
Granted (in dollars per share) | $ / shares	0
Vested and settled (in dollars per share) | $ / shares	15.24
Forfeited and cancelled (in dollars per share) | $ / shares	15.70
Stock and stock units, end of period (in dollars per share) | $ / shares	$ 18.42

[1] Performance units with variable payouts are shown at target level of performance.