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Derivative and Hedging Activities Derivative and Hedging Activities - Gain Loss in Statement of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains reclassified from AOCI into income (effective portion)				$ 424
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	$ 0	[1]	$ (44)
Cost of revenue [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains reclassified from AOCI into income (effective portion)				59
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	0	[1]	(6)
Operating expense [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains reclassified from AOCI into income (effective portion)				365
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	0	[1]	(38)
Other Nonoperating Income (Expense) [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) Recognized in Income on Derivatives (Amount Excluded from Effectiveness Testing	0	[1]	(63)	(87)
Other Nonoperating Income (Expense) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recorded in other expense, net	155		343	344
Other Comprehensive Income (Loss) [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion	$ 0	[1]	$ 202
(Losses) in AOCI on derivatives (effective portion)				$ (133)
[1] The Company did not enter into any new cash flow hedge contracts since December 31, 2016.

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The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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The effective portion of gains on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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