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Financial Instruments - Derivatives (Details) € in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 EUR (€)
Derivatives, Fair Value [Line Items] |  |  |  |
Gain (loss) on net investment hedges, gross | $ (119,298) | $ 22,449 | $ 45,230 |
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax | 26,957 | (4,714) | (9,498) |
Gain (loss) on net investment hedges, net of tax | (92,341) | 17,735 | $ 35,732 |
Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Notional Amount | 173,674 | 179,580 |  |
Not Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Notional Amount | 73,755 | 79,707 |  |
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value - Asset | 2,325 | 2,892 |  |
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Other Accrued Expenses [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Fair Value - Liability | $ 2,057 | $ 476 |  |
Note due 2026 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Face amount of notes | € |  |  |  | € 600,000
Note due 2027 [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Face amount of notes | € |  |  |  | € 500,000

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