INCOME TAXES - Provision (benefit) for income taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ (151)us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ (28)us-gaap_CurrentFederalTaxExpenseBenefit
State	(91)	(383)	568
Foreign	1,663us-gaap_CurrentForeignTaxExpenseBenefit	2,652us-gaap_CurrentForeignTaxExpenseBenefit	1,104us-gaap_CurrentForeignTaxExpenseBenefit
Subtotal	1,421us-gaap_CurrentIncomeTaxExpenseBenefit	2,269us-gaap_CurrentIncomeTaxExpenseBenefit	1,644us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	0	(268)	(35,329)
State	0	(21)	(1,811)
Foreign	(1,185)	(819)	(357)
Subtotal	(1,185)us-gaap_DeferredIncomeTaxExpenseBenefit	(1,108)us-gaap_DeferredIncomeTaxExpenseBenefit	(37,497)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax provision (benefit)	$ 236us-gaap_IncomeTaxExpenseBenefit	$ 1,161us-gaap_IncomeTaxExpenseBenefit	$ (35,853)us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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