INCOME TAXES - Reconciliation of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of income tax provision [Abstract]
Statutory U.S. federal income tax	$ (9,131)	$ 2,042	$ 3,401
U.S. state income tax, net of federal benefit	(340)	(15)	85
Foreign rate differential	692	(1,558)	(1,259)
Domestic production activities deduction	0	(21)	(211)
Tax audit adjustments	0	(338)	812
Intercompany distributions	0	16	2,239
Foreign equity compensation	224	338	234
Deemed repatriation of foreign earnings	810	0	(908)
Current year tax credits	0	(156)	(628)
Impairment of goodwill	498	0	0
Other	(1,513)	(132)	(102)
Change in valuation allowances	6,642	3,737	73
Income tax provision (benefit)	$ (2,118)	$ 3,913	$ 3,736