DERIVATIVE FINANCIAL INSTRUMENTS (Changes in the Fair Value of Derivative Instruments) (Details) - Foreign exchange contracts - Designated as hedging instruments - Cash flow hedging - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cost of revenues (exclusive of depreciation and amortization)
Derivative Instruments, Gain (Loss) [Line Items]
Net (loss)/gain reclassified	$ (1,094)	$ 848	$ (3,605)	$ 738
Accumulated other comprehensive loss
Derivative Instruments, Gain (Loss) [Line Items]
Net (loss)/gain in fair value	$ (650)	$ (2,791)	$ (4,420)	$ 3,192