IMPAIRMENT LOSSES AND RESTRUCTURING CHARGES (Textuals) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Impairment losses	$ 174	$ 323	$ 0
Gain (loss) on disposal of assets	3	509	136
Expense (reversal)	(104)	1,737	2,406
Domestic [Member]
Restructuring Cost and Reserve [Line Items]
Expense (reversal)	(129)	1,561	1,064
Gain on early termination of lease			256
Domestic [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Expense (reversal)		1,289	192
Domestic [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Expense (reversal)		272	609
Domestic [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Expense (reversal)			279
Domestic [Member] | Other Restructuring [Member] | United States [Member]
Restructuring Cost and Reserve [Line Items]
Expense (reversal)		1,461	1,704
Nearshore [Member]
Restructuring Cost and Reserve [Line Items]
Expense (reversal)	25	112	1,342
Nearshore [Member] | Employee Severance [Member] | Costa Rica
Restructuring Cost and Reserve [Line Items]
Expense (reversal)			1,004
Nearshore [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Expense (reversal)		112
Nearshore [Member] | Facility Closing [Member] | Costa Rica
Restructuring Cost and Reserve [Line Items]
Expense (reversal)			338
Offshore [Member]
Restructuring Cost and Reserve [Line Items]
Expense (reversal)	$ 0	$ 64	$ 0