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Derivative Financial Instruments - Schedule of Effect of Derivative Instruments on Statements of Financial Performance (Details) - Cash Flow Hedges - FX Forward Contracts - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivatives Designated as Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain recognized in other comprehensive income	$ (157)	$ 551	$ 75	$ 927
Derivatives Designated as Hedges | Revenues
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified from accumulated other comprehensive income (loss) into earnings: effective portion	7	(9)	(4)	(13)
Derivatives Designated as Hedges | Cost of operations
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified from accumulated other comprehensive income (loss) into earnings: effective portion	(92)	237	28	291
Derivatives Not Designated as Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain recognized in other comprehensive income	$ 5,997	$ 0	$ 5,997	$ 0

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+ References

No definition available.

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- Definition

The effective portion of net gain (loss) 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959

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- Definition

The effective portion of gains and losses (net) 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 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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