SHARE-BASED COMPENSATION - RSUs with Market Conditions (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Restricted Stock Units With Market Conditions [Line Items]
RSUs issued	685,113	361,000	307,000
RSUs issued, Amount	$ 5,754	$ 2,906	$ 2,133
Reconciliation Of RSUs With Market Conditions [Abstract]
RSUs beginning	1,030,486
Number of RSUs granted	685,113	361,000	307,000
Number of RSUs forfeited	(47,011)
Number of RSUs vested	(409,903)	547,000	659,000
RSUs ending	1,258,685	1,030,486
Net RSUs increase (decrease) to APIC	5,232	4,270	5,754
Restricted Stock Units With Market Conditions [Member]
Share-based Compensation Restricted Stock Units With Market Conditions [Line Items]
RSUs issued	290,000	0	0
Reconciliation Of RSUs With Market Conditions [Abstract]
RSUs beginning	0	200,000	300,000
Number of RSUs granted	290,000	0	0
Number of RSUs forfeited	0	(200,000)	0
Number of RSUs vested	0	0	(100,000)
RSUs ending	290,000	0	200,000
RSUs forfeited	0	(2,110)	0
Fair value of each RSU issued with market conditions	$ 6.9	$ 0
Restricted Stock Units With Service Conditions [Member]
Reconciliation Of RSUs With Market Conditions [Abstract]
Number of RSUs forfeited	(47,000)	(64,000)	(26,000)
RSUs forfeited	$ (727)	$ (685)	$ (235)
Restricted Stock Units With Performance Conditions [Member]
Reconciliation Of RSUs With Market Conditions [Abstract]
Number of RSUs forfeited	0

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share weighted average intrinsic value of equity-based compensation awards granted. Excludes stock and unit options.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Value of stock related to Restricted Stock Awards forfeited during the period.

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Aggregate value of stock related to Restricted Stock Awards issued during the period.

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Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.

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