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Derivative Financial Instruments, Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type (Details) - Foreign Exchange Forward [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Oct. 01, 2017
--- | --- | --- | ---
Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net unrealized gain | $ 532 | $ (2,891) | $ 1,253
Not Designated as Hedging Instrument [Member] | Prepaid expenses and other current assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Unrealized gains | 2,060 | 0 | 2,606
Unrealized losses | (1,452) | 0 | (1,353)
Net unrealized gain | 608 | 0 | 1,253
Not Designated as Hedging Instrument [Member] | Accrued liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Unrealized gains | 12 | 1,793 | 0
Unrealized losses | (33) | (4,684) | 0
Net unrealized gain | (21) | (2,891) | 0
Not Designated as Hedging Instrument [Member] | Other liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Unrealized gains | 30 | 0 | 0
Unrealized losses | (85) | 0 | 0
Net unrealized gain | (55) | 0 | 0
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net unrealized gain | 17,434 | (7,934) | (11,949)
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Prepaid expenses and other current assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Unrealized gains | 15,414 | 13,666 | 10,207
Unrealized losses | (4,079) | (10,319) | (7,977)
Net unrealized gain | 11,335 | 3,347 | 2,230
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Unrealized gains | 9,591 | 11,255 | 11,631
Unrealized losses | (1,455) | (2,376) | (3,139)
Net unrealized gain | 8,136 | 8,879 | 8,492
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Accrued liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Unrealized gains | 596 | 4,215 | 5,354
Unrealized losses | (1,182) | (15,484) | (20,999)
Net unrealized gain | (586) | (11,269) | (15,645)
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Unrealized gains | 1,035 | 4,546 | 8,325
Unrealized losses | (2,486) | (13,437) | (15,351)
Net unrealized gain | $ (1,451) | $ (8,891) | $ (7,026)

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- Definition 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 -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 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) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + 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 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 + Details
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