Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, not subject to a master netting arrangement.

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Fair value as of the balance sheet date of all foreign currency derivatives designated as cash flow hedging instruments.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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DERIVATIVES AND HEDGING ACTIVITIES: (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Balance of designated derivative contracts as cash flow hedges and their impact on OCI
Amount of gain reclassified from OCI to income (effective portion)	$ 1,440	$ (422)
Designated as Hedging Instrument [Member]
Notional Disclosures [Abstract]
Currency forward and option contracts	86,729		$ 105,730
Balance of designated derivative contracts as cash flow hedges and their impact on OCI
Balance at the beginning of the period	(692)
Balance at the end of the period	3,552
Not Designated as Hedging Instrument [Member]
Notional Disclosures [Abstract]
Currency forward and option contracts	44,879		34,330
Foreign Exchange Forward [Member] \| Other Current Assets [Member]
Derivative, Fair Value, Net [Abstract]
Currency forward contracts, assets	3,398		257
Foreign Exchange Forward [Member] \| Other Current Assets [Member] \| Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Currency forward contracts, assets	3,398		257
Foreign Exchange Forward [Member] \| Other Current Assets [Member] \| Not Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Currency forward contracts, assets	0		0
Foreign Exchange Forward [Member] \| Other Current Liabilities [Member]
Derivative, Fair Value, Net [Abstract]
Currency forward contracts, liabilities	6		1,006
Foreign Exchange Forward [Member] \| Other Current Liabilities [Member] \| Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Currency forward contracts, liabilities	3		999
Foreign Exchange Forward [Member] \| Other Current Liabilities [Member] \| Not Designated as Hedging Instrument [Member]
Derivative, Fair Value, Net [Abstract]
Currency forward contracts, liabilities	3		$ 7
Operating Expense [Member] \| Designated as Hedging Instrument [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Summary of Derivative Instruments Impact on Results of Operations [Abstract]
Other income	1,436	138
Operating Expense [Member] \| Not Designated as Hedging Instrument [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Summary of Derivative Instruments Impact on Results of Operations [Abstract]
Other income	0	0
Nonoperating Income (Expense) [Member] \| Designated as Hedging Instrument [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Summary of Derivative Instruments Impact on Results of Operations [Abstract]
Other income	0	0
Nonoperating Income (Expense) [Member] \| Not Designated as Hedging Instrument [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Summary of Derivative Instruments Impact on Results of Operations [Abstract]
Other income	2,066	272
Unrealized gains (losses) on derivatives designated as hedging instruments [Member]
Balance of designated derivative contracts as cash flow hedges and their impact on OCI
Amount of gain recognized in OCI (effective portion)	5,680	3,630
Amount of gain reclassified from OCI to income (effective portion)	(1,436)	$ (138)
Unrealized gains (losses) on derivatives designated as hedging instruments [Member] \| Designated as Hedging Instrument [Member]
Balance of designated derivative contracts as cash flow hedges and their impact on OCI
Amount of gain recognized in OCI (effective portion)	5,680
Amount of gain reclassified from OCI to income (effective portion)	$ (1,436)