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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Fair Value of Derivative Instruments
Derivative Assets	$ 680		$ 680		$ 663
Derivative Liabilities	5,882		5,882		17,913
Foreign Exchange Contract, Amount of Gain (Loss) Recognized in Income on Derivative, not designated as hedging instruments	972	$ (49,762)	1,113	$ (49,117)
Foreign Exchange Contracts
Fair Value of Derivative Instruments
Aggregate amount of forward exchange contracts outstanding	105,300		105,300
Foreign Exchange Contract, Amount of Gain (Loss) Recognized in Income on Derivative, not designated as hedging instruments	972	$ (49,762)	1,113	$ (49,117)
Derivative Contracts Not Designated as Hedging Instruments
Fair Value of Derivative Instruments
Derivative Assets	680		680		663
Derivative Liabilities	398		398		1,604
Derivative Contracts Not Designated as Hedging Instruments \| Foreign Exchange Contracts \| Prepayments and other
Fair Value of Derivative Instruments
Derivative Assets	680		680		663
Derivative Contracts Not Designated as Hedging Instruments \| Foreign Exchange Contracts \| Accounts payable and accrued liabilities
Fair Value of Derivative Instruments
Derivative Liabilities	398		398		1,604
Derivative Contracts Designated as Hedging Instruments
Fair Value of Derivative Instruments
Derivative Liabilities	5,484		5,484		16,309
Derivative Contracts Designated as Hedging Instruments \| Cross Currency Swap Contract \| Accounts payable and accrued liabilities
Fair Value of Derivative Instruments
Derivative Liabilities	$ 5,484		$ 5,484		$ 16,309