INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Contingency [Line Items]
Provision for income taxes	$ 232	$ 217	$ 417	$ 385
Income tax provision due to U.S. federal and state income taxes and foreign income taxes			400	300
Income tax provision discrete expense				$ 100
Unrecognized tax benefits	13,600		13,600
Unrecognized tax benefits that would not impact the effective tax rate	12,800		12,800
Unrecognized tax benefits increase	1,300		3,300
Earnings of foreign subsidiaries to be reinvested indefinitely	$ 2,700		$ 2,700
Federal and State Tax Jurisdictions
Income Tax Contingency [Line Items]
Open tax year			2003
Canada, Ireland, United Kingdom and Germany Tax Jurisdictions
Income Tax Contingency [Line Items]
Open tax year			2010