SHARE-BASED COMPENSATION - RSUs with Market Conditions (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Share-based Compensation Restricted Stock Units With Market Conditions [Line Items]
RSUs issued	701,527
Reconciliation Of RSUs With Market Conditions [Abstract]
RSUs beginning	1,258,685
Number of RSUs granted	701,527
Number of RSUs forfeited	(53,498)
Number of RSUs vested	(394,130)
RSUs ending	1,512,584	1,258,685
Net RSUs increase (decrease) to APIC	$ 4,097	$ 5,232
Restricted Stock Units With Market Conditions [Member]
Share-based Compensation Restricted Stock Units With Market Conditions [Line Items]
RSUs issued	165,000	290,000
Reconciliation Of RSUs With Market Conditions [Abstract]
RSUs beginning	290,000
Number of RSUs granted	165,000	290,000
Number of RSUs forfeited	0	0
Number of RSUs vested	(65,000)	0
RSUs ending	390,000	290,000
Fair value of each RSU issued with market conditions	$ 8.39	$ 6.9
Restricted Stock Units With Market Conditions [Member] | Maximum [Member]
Reconciliation Of RSUs With Market Conditions [Abstract]
RSUs beginning	8,000
RSUs ending		8,000
Restricted Stock Units With Performance Conditions [Member]
Share-based Compensation Restricted Stock Units With Market Conditions [Line Items]
RSUs issued	22,000	11,000
Reconciliation Of RSUs With Market Conditions [Abstract]
Number of RSUs granted	22,000	11,000
Number of RSUs forfeited	0	(3,000)
Number of RSUs vested	0	0
RSUs ending	30,000
Fair value of each RSU issued with market conditions	$ 11.11	$ 9.6