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Derivatives and Hedging - Gains (Losses) Associated with Fair Value and Cash Flow Hedges (Details) - USD ($) $ in Thousands | 12 Months Ended
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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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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 + Details
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