STOCK-BASED COMPENSATION - Schedule of Awards Outstanding and Exercisable (Details) - Stock Options and Stock Appreciation Rights (SARs) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average exercise prices (dollars per share)	$ 7.16	$ 7.29
Grants outstanding (shares)	99
Grants exercisable (shares)	89
$8.14 to $10.21
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, minimum (dollars per share)	$ 8.14
Range of exercise prices, maximum (dollars per share)	10.21
Weighted average exercise prices (dollars per share)	$ 8.83
Grants outstanding (shares)	45
Intrinsic value - grants outstanding	$ 0
Grants exercisable (shares)	35
Intrinsic value - grants exercisable	$ 0
$5.45 to $5.86
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of exercise prices, minimum (dollars per share)	$ 5.45
Range of exercise prices, maximum (dollars per share)	5.86
Weighted average exercise prices (dollars per share)	$ 5.76
Grants outstanding (shares)	54
Intrinsic value - grants outstanding	$ 0
Grants exercisable (shares)	54
Intrinsic value - grants exercisable	$ 0