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Fair Value of Financial Instruments Additional Information (Details) - Forward contracts - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Derivative, notional amount | $ 531,000 |  | $ 531,000 |  | $ 357,400
Other accounts receivable |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair value foreign currency forward contracts, asset | 142 |  | 142 |  | 0
Accrued expenses |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair value foreign currency forward contracts, liabilities | 0 |  | 0 |  | $ 4,954
Other expenses, net |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Recognized (losses) gains of foreign currency forward contracts | $ (203) | $ 803 | (13,034) | $ 9,010 |
Other, net |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Change in the fair value of foreign currency forward contracts |  |  | 13,000 | (9,000) |
Cash settlements |  |  | $ (18,100) |  |
Cash receipts |  |  |  | $ 8,900 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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