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Summary of Significant Accounting Policies - AOCI Foreign Exchange (Details) € in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 EUR (€) | Jun. 30, 2018 EUR (€)
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Derivative, amount of hedged item (in Euros) | € |  |  |  |  | € 274,161 | € 179,881
Senior Notes |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Foreign currency translation adjustments gains (losses) | $ (4,280) | $ 10,257 | $ 1,861 | $ 4,622 |  |
Net Investment Hedging [Member] | Senior Notes |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Foreign currency translation adjustments gains (losses) |  |  | $ 16,119 |  |  |

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