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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Notional Amount and Fair Value (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Foreign currency exchange contracts | Maximum
Derivative Instruments and Hedging Activities
Term of derivative instrument	1 month
Not designated as hedging instruments | Accounts receivable, net | Receive USD/pay EUR
Derivative Instruments and Hedging Activities
Notional amount, Assets	$ 31,411
Fair Value, Assets	111
Not designated as hedging instruments | Accounts receivable, net | Receive USD/pay GBP
Derivative Instruments and Hedging Activities
Notional amount, Assets	28,315
Fair Value, Assets	105
Not designated as hedging instruments | Accounts receivable, net | Receive USD/pay ZAR
Derivative Instruments and Hedging Activities
Notional amount, Assets	14,375
Fair Value, Assets	53
Not designated as hedging instruments | Accounts receivable, net | Receive NOK/pay USD
Derivative Instruments and Hedging Activities
Notional amount, Assets	1,450	$ 1,534
Fair Value, Assets	2	18
Not designated as hedging instruments | Accounts receivable, net | Receive USD/pay COP
Derivative Instruments and Hedging Activities
Notional amount, Assets		2,803
Fair Value, Assets		13
Not designated as hedging instruments | Accounts receivable, net | Receive SGD/pay USD
Derivative Instruments and Hedging Activities
Notional amount, Assets		223
Fair Value, Assets		2
Not designated as hedging instruments | Accounts receivable, net | Receive CAD/pay USD
Derivative Instruments and Hedging Activities
Notional amount, Assets		4,892
Fair Value, Assets		61
Not designated as hedging instruments | Accounts receivable, net | Receive USD/pay BRL
Derivative Instruments and Hedging Activities
Notional amount, Assets		1,806
Fair Value, Assets		1
Not designated as hedging instruments | Accrued liabilities | Receive USD/pay EUR
Derivative Instruments and Hedging Activities
Notional amount, Liabilities		65,131
Fair Value, Liabilities		(642)
Not designated as hedging instruments | Accrued liabilities | Receive USD/pay GBP
Derivative Instruments and Hedging Activities
Notional amount, Liabilities		31,342
Fair Value, Liabilities		(334)
Not designated as hedging instruments | Accrued liabilities | Receive USD/pay ZAR
Derivative Instruments and Hedging Activities
Notional amount, Liabilities		21,311
Fair Value, Liabilities		(222)
Not designated as hedging instruments | Accrued liabilities | Receive USD/pay COP
Derivative Instruments and Hedging Activities
Notional amount, Liabilities	3,789
Fair Value, Liabilities	(34)
Not designated as hedging instruments | Accrued liabilities | Receive SGD/pay USD
Derivative Instruments and Hedging Activities
Notional amount, Liabilities	7,342
Fair Value, Liabilities	(23)
Not designated as hedging instruments | Accrued liabilities | Receive USD/pay AUD
Derivative Instruments and Hedging Activities
Notional amount, Liabilities	12,484	17,238
Fair Value, Liabilities	(18)	(177)
Not designated as hedging instruments | Accrued liabilities | Receive USD/pay NZD
Derivative Instruments and Hedging Activities
Notional amount, Liabilities	2,645	1,826
Fair Value, Liabilities	(7)	(18)
Not designated as hedging instruments | Accrued liabilities | Receive USD/pay MXN
Derivative Instruments and Hedging Activities
Notional amount, Liabilities	2,044	7,720
Fair Value, Liabilities	(6)	(126)
Not designated as hedging instruments | Accrued liabilities | Receive RUB/pay USD
Derivative Instruments and Hedging Activities
Notional amount, Liabilities	909
Fair Value, Liabilities	$ (5)
Not designated as hedging instruments | Accrued liabilities | Receive USD/pay CLP
Derivative Instruments and Hedging Activities
Notional amount, Liabilities		1,112
Fair Value, Liabilities		(8)
Not designated as hedging instruments | Accrued liabilities | Receive USD/pay TRY
Derivative Instruments and Hedging Activities
Notional amount, Liabilities		5,483
Fair Value, Liabilities		$ (52)

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

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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 elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section 55
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Nominal or face amount used to calculate payments on the derivative liability.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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