RESTRUCTURING CHARGES AND IMPAIRMENT LOSSES (LIABILITY ROLLFORWARD TABLE) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning balance, restructuring reserve	$ 2,103
Expense	2,037
Payments	(1,886)
Changes due to foreign currency	(123)
Change in estimates	(154)
Ending balance, restructuring reserve	1,977
Reduction in Force [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, restructuring reserve	694
Expense	545
Payments	(711)
Changes due to foreign currency	(123)
Change in estimates	(154)
Ending balance, restructuring reserve	251
Closure of Delivery Centers [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance, restructuring reserve	1,409
Expense	1,492
Payments	(1,175)
Ending balance, restructuring reserve	$ 1,726