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Long-term Debt - Narratives (Details) € in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 08, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 EUR (€) | Dec. 31, 2017 USD ($)
Debt Instrument |  |  |  |  |
Long-term debt, fair value difference from carrying value |  | $ 26,578,000 | $ 26,578,000 |  | $ 59,319,000
Currency swap |  |  |  |  |
Debt Instrument |  |  |  |  |
Derivative instrument |  | 324,940,000 | 324,940,000 | € 280,000 |
Term Loan | New Term Loan Facility |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt instrument face amount | $ 1,267,000,000 |  |  |  |
Scheduled repayment percentage | 0.25% |  |  |  |
Debt extinguishment costs, write-off of deferred financing costs |  | 258,000 | 258,000 |  |
Debt extinguishment costs, write-off of debt discounts |  | 606,000 | 606,000 |  |
Repayments of notes |  | $ 45,000,000 |  |  |
Term Loan | New Term Loan Facility | LIBOR |  |  |  |  |
Debt Instrument |  |  |  |  |
Variable rate on spread | 2.50% |  |  |  |
Term Loan | Term Loan Facility |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt extinguishment costs, financing costs |  |  | 2,124,000 |  |
Debt extinguishment costs, write-off of deferred financing costs |  |  | 1,403,000 |  |
Debt extinguishment costs, write-off of debt discounts |  |  | $ 2,352,000 |  |

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