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Derivative Instruments and Hedging Activities - Hedge of Net Investment (Details) - Euro Notes - Net Investment Hedges - Designated as Hedging Instrument € in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 EUR (€) | Sep. 30, 2018 EUR (€)
Derivative [Line Items] |  |  |  |  |  |
Hedged notes | € |  |  |  |  | € 279,821 | € 209,276
Foreign exchange gains (losses) | $ 13,101 | $ 2,139 | $ 14,962 | $ 6,761 |  |
Cumulative net gains |  |  | $ 29,220 |  |  |

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