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Hedging Instruments (Narrative) (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2018 EUR (€) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Derivative [Line Items] |  |  |  |  |
Estimated net amount of gains expected to be reclassified out of accumulated other comprehensive income and into earnings within next 12 months | $ 5,800 |  |  |  |
Cash Flow Hedge, hedge percentage of estimated exposure from intercompany products purchases and sales | 85.00% |  |  |  |
General duration of foreign currency exchange contracts | 24 months |  |  |  |
Notional Amount of Foreign Currency Exchange Contracts |  |  |  | $ 210,400 | $ 176,500
Unrealized loss on net investment hedge | $ (2,216) | $ (1,093) |  |  |
Series C Senior Note [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Debt instrument, face amount | € |  |  | € 88,900,000 |  |
Stated interest rate |  |  | 1.785% | 1.785% |

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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 The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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