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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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Fair Value of Derivative Instruments
Derivative Assets	$ 6,711		$ 6,711		$ 259
Derivative Liabilities	597		597		1,371
Foreign Exchange Contract, Amount of Gain (Loss) Recognized in Income on Derivative, not designated as hedging instruments	(15)	$ (1,011)	(529)	$ 102
Foreign Exchange Contracts
Fair Value of Derivative Instruments
Aggregate amount of forward exchange contracts outstanding	43,900		43,900
Foreign Exchange Contract, Amount of Gain (Loss) Recognized in Income on Derivative, not designated as hedging instruments	(15)	$ (1,011)	(529)	$ 102
Derivative Contracts Not Designated as Hedging Instruments
Fair Value of Derivative Instruments
Derivative Assets	38		38		259
Derivative Liabilities	597		597		331
Derivative Contracts Not Designated as Hedging Instruments \| Foreign Exchange Contracts \| Prepaid and other
Fair Value of Derivative Instruments
Derivative Assets	38		38		259
Derivative Contracts Not Designated as Hedging Instruments \| Foreign Exchange Contracts \| Accounts payable and accrued liabilities
Fair Value of Derivative Instruments
Derivative Liabilities	597		597		331
Derivative Contracts Designated as Hedging Instruments
Fair Value of Derivative Instruments
Derivative Assets	6,673		6,673
Derivative Liabilities					1,040
Derivative Contracts Designated as Hedging Instruments \| Cross Currency Swap Contract \| Prepaid and other
Fair Value of Derivative Instruments
Derivative Assets	$ 6,673		$ 6,673
Derivative Contracts Designated as Hedging Instruments \| Cross Currency Swap Contract \| Accounts payable and accrued liabilities
Fair Value of Derivative Instruments
Derivative Liabilities					$ 1,040