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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Fair Value of Derivative Instruments in the Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Fair Value of Derivative Instruments
Derivative Assets	$ 289		$ 663
Derivative Liabilities	24,636		17,913
Foreign Exchange Contract, Amount of Gain (Loss) Recognized in Income on Derivative, not designated as hedging instruments	141	$ 645
Foreign Exchange Contracts
Fair Value of Derivative Instruments
Aggregate amount of forward exchange contracts outstanding	104,800
Foreign Exchange Contract, Amount of Gain (Loss) Recognized in Income on Derivative, not designated as hedging instruments	141	$ 645
Derivative Contracts Not Designated as Hedging Instruments
Fair Value of Derivative Instruments
Derivative Assets	289		663
Derivative Liabilities	1,106		1,604
Derivative Contracts Not Designated as Hedging Instruments \| Foreign Exchange Contracts \| Prepayments and other
Fair Value of Derivative Instruments
Derivative Assets	289		663
Derivative Contracts Not Designated as Hedging Instruments \| Foreign Exchange Contracts \| Accounts payable and accrued liabilities
Fair Value of Derivative Instruments
Derivative Liabilities	1,106		1,604
Derivative Contracts Designated as Hedging Instruments
Fair Value of Derivative Instruments
Derivative Liabilities	23,530		16,309
Derivative Contracts Designated as Hedging Instruments \| Cross Currency Swap Contract \| Accounts payable and accrued liabilities
Fair Value of Derivative Instruments
Derivative Liabilities	$ 23,530		$ 16,309