STOCK-BASED COMPENSATION - Schedule of Activity of Equity Compensation Plans (Details) - Stock Options and Stock Appreciation Rights (SARs) shares in Thousands	9 Months Ended
	Sep. 30, 2018 $ / shares shares
Number of Shares
Outstanding, beginning (shares) | shares	211
Granted (shares) | shares	30
Exercised (shares) | shares	(100)
Expired or cancelled (shares) | shares	(17)
Outstanding, ending (shares) | shares	124
Exercisable (shares) | shares	104
Weighted Average Exercise Price
Outstanding, beginning (dollars per share) | $ / shares	$ 6.64
Granted (dollars per share) | $ / shares	8.14
Exercised (dollars per share) | $ / shares	5.79
Expired or cancelled (dollars per share) | $ / shares	9.76
Outstanding, ending (dollars per share) | $ / shares	7.24
Exercisable, weighted average exercise price (dollars per share) | $ / shares	$ 7.06