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Debt Textuals (Details) € in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) Rate | Dec. 31, 2016 USD ($) Rate | Dec. 31, 2015 USD ($) | Dec. 31, 2017 EUR (€) Rate
Debt Instrument |  |  |  |
Combined Senior Notes | $ 250,000 |  |  |
Derivatives used in Net Investment Hedge, Increase (Decrease), Gross of Tax | 18,200 | $ 5,100 |  |
Senior Notes | $ 498,298 | 479,865 |  |
Consolidated Interest Coverage Ratio Covenant | 3.5 to 1.0 |  |  |
Consolidated Leverage Ratio Covenant | 3.5 to 1.0 |  |  |
Debt issuance costs | $ 7,205 | $ 209 | $ 1,366 |
Debt, Weighted Average Interest Rate | Rate | 3.27% | 3.66% |  | 3.27%
3.67% Senior Notes |  |  |  |
Debt Instrument |  |  |  |
Senior Notes, Stated Interest Rate | 3.67% |  |  | 3.67%
Senior Notes | $ 50,000 | $ 50,000 |  |
Maturity Date | Dec. 17, 2022 |  |  |
Debt Instrument, Covenant Compliance | The Company was in compliance with its covenants at December 31, 2017. |  |  |
Debt issuance costs | $ 400 |  |  |
Amortized Issuance Costs Period | 10 years |  |  |
4.10% Senior Notes [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior Notes, Stated Interest Rate | 4.10% |  |  | 4.10%
Senior Notes | $ 50,000 | 50,000 |  |
Maturity Date | Sep. 19, 2023 |  |  |
Debt Instrument, Covenant Compliance | The Company was in compliance with its covenants at December 31, 2017. |  |  |
Debt issuance costs | $ 400 |  |  |
Amortized Issuance Costs Period | 10 years |  |  |
3.84% Senior Notes [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior Notes, Stated Interest Rate | 3.84% |  |  | 3.84%
Senior Notes | $ 125,000 | 125,000 |  |
Maturity Date | Sep. 19, 2024 |  |  |
Debt Instrument, Covenant Compliance | The Company was in compliance with its covenants at December 31, 2017. |  |  |
Debt issuance costs | $ 900 |  |  |
Amortized Issuance Costs Period | 10 years |  |  |
4.24% Senior Notes [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior Notes, Stated Interest Rate | 4.24% |  |  | 4.24%
Senior Notes | $ 125,000 | 125,000 |  |
Maturity Date | Jun. 25, 2025 |  |  |
Debt Instrument, Covenant Compliance | The Company was in compliance with these covenants at December 31, 2017. |  |  |
1.47% EURO Senior Notes [Member] |  |  |  |
Debt Instrument |  |  |  |
Senior Notes, Stated Interest Rate | 1.47% |  |  | 1.47%
Senior Notes | $ 149,736 | $ 131,507 |  | € 125,000
Maturity Date | Jun. 17, 2030 |  |  |
Debt Instrument, Covenant Compliance | The Company was in compliance with its covenants at December 31, 2017. |  |  |
Debt issuance costs | $ 400 |  |  |
Amortized Issuance Costs Period | 15 years |  |  |
$800 Million 2015 Credit Agreement |  |  |  |
Debt Instrument |  |  |  |
Maturity Date | Dec. 17, 2020 |  |  |
Debt Instrument, Covenant Compliance | the Company was in compliance as of December 31, 2017. |  |  |
Debt issuance costs | $ 1,100 |  |  |
Amortized Issuance Costs Period | 2020 |  |  |
Credit Agreement Borrowing Capacity | $ 800,000 |  |  |
$800 million Credit Agreement, Basis Spread on Variable Rate | 0.875% |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 332,600 |  |  |
$800 Million Credit 2013 Credit Agreement [Member] |  |  |  |
Debt Instrument |  |  |  |
Credit Agreement Borrowing Capacity | 800,000 |  |  |
Gains (Losses) on Extinguishment of Debt | $ (129) |  |  |

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