RESTRUCTURING CHARGES AND IMPAIRMENT LOSSES (LIABLITY ROLLFORWARD TABLE) (DETAILS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Beginning balance, restructuring reserve	$ 1,566	$ 806
Expense	3,535	4,720
Payments	(2,800)	(3,540)
Changes due to foreign currency	(43)	(92)
Change in estimates	(155)	(328)
Ending balance, restructuring reserve	2,103	1,566
Reduction in Force [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, restructuring reserve	1,468	806
Expense	1,316	3,728
Payments	(1,892)	(2,646)
Changes due to foreign currency	(43)	(92)
Change in estimates	(155)	(328)
Ending balance, restructuring reserve	694	1,468
Facility Exit and Other Charges [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, restructuring reserve	98
Expense	2,219	992
Payments	(908)	(894)
Ending balance, restructuring reserve	$ 1,409	$ 98