DERIVATIVE FINANCIAL INSTRUMENTS (Changes in the Fair Value of Derivative Instruments) (Details) - Foreign Exchange Contract - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Designated as hedging instrument \| Cash flow hedging \| Accumulated Other Comprehensive Loss
Derivative Instruments, Gain (Loss) [Line Items]
Change in fair value	$ (3,294)	$ 0	$ 0
Designated as hedging instrument \| Cash flow hedging \| Cost of Revenues (Exclusive of Depreciation and Amortization) \| Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Net loss reclassified	(4,161)	0	0
Not designated as hedging instrument \| Foreign Exchange Gain/(Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Net gain recognized	$ 44	$ 425	$ 92

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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