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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Fair Value of Derivative Instruments
Derivative Assets	$ 266		$ 266		$ 259
Derivative Liabilities	809		809		1,371
Foreign Exchange Contract, Amount of Gain (Loss) Recognized in Income on Derivative, not designated as hedging instruments	(251)	$ 972	(514)	$ 1,113
Foreign Exchange Contracts
Fair Value of Derivative Instruments
Aggregate amount of forward exchange contracts outstanding	56,900		56,900
Foreign Exchange Contract, Amount of Gain (Loss) Recognized in Income on Derivative, not designated as hedging instruments	(251)	$ 972	(514)	$ 1,113
Derivative Contracts Not Designated as Hedging Instruments
Fair Value of Derivative Instruments
Derivative Assets	157		157		259
Derivative Liabilities	736		736		331
Derivative Contracts Not Designated as Hedging Instruments \| Foreign Exchange Contracts \| Prepaid and other
Fair Value of Derivative Instruments
Derivative Assets	157		157		259
Derivative Contracts Not Designated as Hedging Instruments \| Foreign Exchange Contracts \| Accounts payable and accrued liabilities
Fair Value of Derivative Instruments
Derivative Liabilities	736		736		331
Derivative Contracts Designated as Hedging Instruments
Fair Value of Derivative Instruments
Derivative Assets	109		109
Derivative Liabilities	73		73		1,040
Derivative Contracts Designated as Hedging Instruments \| Cross Currency Swap Contract \| Prepaid and other
Fair Value of Derivative Instruments
Derivative Assets	109		109
Derivative Contracts Designated as Hedging Instruments \| Cross Currency Swap Contract \| Accounts payable and accrued liabilities
Fair Value of Derivative Instruments
Derivative Liabilities	$ 73		$ 73		$ 1,040