SHARE-BASED COMPENSATION - Equity Compensation Plan and RSU Acitivity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restricted Stock Unit Activity [Abstract]
RSUs issued	1,122,585	796,000	685,000
RSUs forfeited	(26,825)	(58,000)	(47,000)
Net RSUs issued and increase (decrease) to paid-in capital	1,096,000	738,000	638,000
RSUs vested and released	611,383	406,000	410,000
RSUs issued, Amount	$ 10,381	$ 9,045	$ 5,754
Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures To Paid In Capital	$ 10,101	$ 8,336	$ 5,027
Equity Compensation Plan [Abstract]
Additional shares available for grant during the next period	1,500,000
Shares available for grant	1,400,000