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Derivatives - Forward Notional Contracts (Details) - Dec. 31, 2017 - Foreign currency forward contracts € in Thousands, ₩ in Thousands, ¥ in Thousands, ¥ in Thousands, £ in Thousands, SGD in Thousands, SFr in Thousands, SEK in Thousands, MXN in Thousands, HKD in Thousands, DKK in Thousands, CAD in Thousands, BRL in Thousands, AUD in Thousands | AUD | CNY (¥) | DKK | MXN | CHF (SFr) | KRW (₩) | GBP (£) | CAD | JPY (¥) | SGD | SEK | EUR (€) | HKD | BRL
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Not designated as hedging instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivative | AUD 5,600 | ¥ 22,990 | DKK 1,881 | MXN 17,540 | SFr 242 | ₩ 1,800,000 | £ 1,868 | CAD 2,076 | ¥ 178,500 | SGD 5,023 | SEK 4,775 | € 23,333 | HKD 11,000 | BRL 8,500
Derivatives designated as cash flow hedges | Designated as hedging instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivative |  | ¥ 45,000 | DKK 14,470 | MXN 95,075 | SFr 1,375 |  | £ 3,625 | CAD 2,310 |  |  | SEK 16,330 | € 9,165 |  |

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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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