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Derivatives and Hedging - Gains (Losses) Associated with Fair Value and Cash Flow Hedges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss)
After-tax amount of gain (loss) recognized in OCI	$ 5,499	$ (5,943)	$ (3,260)
After-tax amount of gain (loss) reclassified from AOCI into earnings	808	(4,823)	(2,959)
Commodity contracts
Derivative Instruments, Gain (Loss)
After-tax amount of gain (loss) recognized in OCI	44	401	(728)
Commodity contracts | Total cost of revenue
Derivative Instruments, Gain (Loss)
After-tax amount of gain (loss) reclassified from AOCI into earnings	52	(550)	(385)
Foreign currency contracts
Derivative Instruments, Gain (Loss)
After-tax amount of gain (loss) recognized in OCI	5,455	(6,344)	(2,532)
Foreign currency contracts | Total cost of revenue
Derivative Instruments, Gain (Loss)
After-tax amount of gain (loss) reclassified from AOCI into earnings	1,805	(3,224)	(1,525)
Foreign currency contracts | Corporate general and administrative expense
Derivative Instruments, Gain (Loss)
Pre-tax net gains (losses) recognized in earnings associated with hedging instruments designated as fair value hedges	5,415	(2,886)	(5,191)
Interest rate contracts | Interest expense
Derivative Instruments, Gain (Loss)
After-tax amount of gain (loss) reclassified from AOCI into earnings	$ (1,049)	$ (1,049)	$ (1,049)

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- Definition

Amount after tax of the effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount after tax of 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.

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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the 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 (a)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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