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Derivative Instruments and Hedging Activities - Forward Currency Contracts (Details) - Foreign Exchange Currency Forward Contracts € in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€)
Derivative [Line Items] |  |  |  |  |  |
Losses on derivatives | $ 0 | $ 616,000 | $ 737,000 | $ 4,172,000 |  |
Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 0 |  | $ 0 |  |  |
Not Designated as Hedging Instrument | Purchase |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | € |  |  |  |  |  | € 29,000
Not Designated as Hedging Instrument | Sell |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  |  |  |  | $ 33,374,000 |
Not Designated as Hedging Instrument | Prepaid expenses and other |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative asset |  |  |  |  | $ 93,000 |

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