STOCK-BASED COMPENSATION - Schedule of Activity of Equity Compensation Plans (Details) - Stock Options and Stock Appreciation Rights (SARs) shares in Thousands	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning (shares) | shares	211
Granted (shares) | shares	30
Exercised (shares) | shares	0
Expired or cancelled (shares) | shares	(15)
Outstanding, ending (shares) | shares	226
Exercisable (shares) | shares	206
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, beginning (dollars per share) | $ / shares	$ 6.64
Granted (dollars per share) | $ / shares	8.14
Exercised (dollars per share) | $ / shares	0.00
Expired or cancelled (dollars per share) | $ / shares	10.81
Outstanding, ending (dollars per share) | $ / shares	6.56
Exercisable, weighted average exercise price (dollars per share) | $ / shares	$ 6.41