SHARE-BASED COMPENSATION - Equity Compensation Plan and RSU Acitivity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted Stock Unit Activity [Abstract]
RSUs issued	685,113	361,000	307,000
RSUs forfeited	(47,011)
Net RSUs issued and increase (decrease) to paid-in capital	638,000	97,000	281,000
RSUs vested and released	409,903	(547,000)	(659,000)
RSUs issued, Amount	$ 5,754	$ 2,906	$ 2,133
Net RSUs issued and increase (decrease) to paid-in capital, Amount	$ 5,027	$ 111	$ 1,898
Equity Compensation Plan [Abstract]
Additional shares available for grant during the next period	1,500,000
Shares available for grant	3,200,000