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Debt Textuals (Details) € in Thousands, $ in Thousands, SFr in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Rate | Dec. 31, 2019 USD ($) Rate | Dec. 31, 2018 USD ($) | Dec. 31, 2020 EUR (€) Rate | Dec. 31, 2020 CHF (SFr) Rate
Debt Instrument [Line Items] |  |  |  |  |
Debt, Weighted Average Interest Rate | Rate | 2.90% | 3.30% |  | 2.90% | 2.90%
Senior Notes | $ 791,102 | $ 714,351 |  |  |
Forward Currency Forward Contract | 152,100 |  |  |  |
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), Reclassification, before Tax | 27,300 | 1,300 | $ 6,700 |  |
Cumulative (gain) loss in other other comprehensive income related to the change in a net investment hedge. | 28,800 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 1,100,000 |  |  |  |
Debt Instrument, Covenant Description | The agreements also require the Company to maintain a consolidated interest coverage ratio of not less than 3.5 to 1.0 and a consolidated leverage ratio of not more than 3.5 to 1.0. |  |  |  |
Debt Instrument, Covenant Compliance | The Company was in compliance with its covenants at December 31, 2020. |  |  |  |
Debt Issuance Costs, Gross | $ 3,400 |  |  |  |
Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 602,500 |  |  |  |
Debt Instrument, Maturity Date | Jun. 15, 2023 |  |  |  |
Debt Instrument, Covenant Description | The Company is required to maintain a ratio of funded debt to consolidated EBITDA of 3.5 to 1.0 or less and an interest coverage ratio of 3.5 to 1.0 or greater. |  |  |  |
Debt Instrument, Covenant Compliance | The Company was in compliance with its covenants as of December 31, 2020. |  |  |  |
Debt Issuance Costs, Gross | $ 2,000 |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | Rate | 0.875% |  |  |  |
1.47% EURO Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Notes | $ 153,299 | 140,197 |  | € 125,000 |
Debt Instrument, Interest Rate, Stated Percentage | 1.47% |  |  | 1.47% | 1.47%
Debt Instrument, Maturity Date | Jun. 17, 2030 |  |  |  |
1.30% Euro-Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Notes | $ 165,563 | $ 151,413 |  | € 135,000 |
Debt Instrument, Interest Rate, Stated Percentage | 1.30% |  |  | 1.30% | 1.30%
Debt Instrument, Maturity Date | Nov. 06, 2034 |  |  |  |
Swiss Pension Loans [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Payable, Related Parties | $ 39,600 |  |  |  |
Swiss Pension Loans (local currency) | SFr |  |  |  |  | SFr 38
Debt Instrument, Basis Spread on Variable Rate | Rate | 87.50% |  |  |  |
1.06% Euro-Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Notes | € |  |  |  | € 125,000 |
Debt Instrument, Interest Rate, Stated Percentage | Rate | 1.06% |  |  | 1.06% | 1.06%

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