INCOME TAXES - Provision (benefit) for income taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
Federal	$ 0	$ (28)	$ 0
State	(383)	568	106
Foreign	2,652	1,104	1,038
Subtotal	2,269	1,644	1,144
Deferred:
Federal	(268)	(35,329)	0
State	(21)	(1,811)	0
Foreign	(819)	(357)	261
Subtotal	(1,108)	(37,497)	261
Income tax provision (benefit)	$ 1,161	$ (35,853)	$ 1,405