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Derivative Instruments (Details) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 27, 2020 USD ($) | Oct. 03, 2011 USD ($) | Apr. 30, 2018 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 09, 2011 | Sep. 29, 2011 USD ($) | Jul. 12, 2011 USD ($) | Dec. 06, 2010 | Apr. 15, 2010 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of interest expense |  |  |  |  |  | $ 1,716 | $ 1,355 | $ 1,332 |  |  |  |  |  |
Amount to be recognized from hedged transactions within 12 months, approximate |  |  |  |  |  | 2,500 |  |  |  |  |  |  |  |
Additional interest rate contract settlement |  |  |  | $ 4,000 |  |  |  |  |  |  |  |  |  |
Non-cash interest expense associated with forward starting swaps |  |  |  |  |  | $ 6,021 | $ 6,327 | 6,475 |  |  |  |  |  |
Other (Income) Expense Net |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency transaction loss |  |  |  |  |  |  |  | 900 |  |  |  |  |  |
Switzerland |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stamp duty expense |  |  | $ 2,200 |  |  |  |  |  |  |  |  |  |  |
4.50% Senior Notes, due December 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  |  | 4.50% |  |  |  |  |  | 4.50% |
4.50% Senior Notes, due December 2020 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  | 4.50% |  |  |  |  |  |  |  |
Amount to be recognized from hedged transactions within 12 months, approximate | $ (1,400) |  |  |  |  |  |  |  |  |  |  |  |  |
4.20% Senior Notes, due December 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  | 4.20% | 4.20% |  |  | 4.20% |  |  |  |
4.20% Senior Notes, due December 2021 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  | 4.20% |  |  |  |  |  |  |  |
Interest Rate Exchange Agreement Expiring 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000
Interest rate contract settlement amount |  |  |  |  | $ 31,000 |  |  |  |  |  |  |  |  |
Amortization of interest expense |  |  |  |  | $ 31,000 |  |  |  |  |  |  |  |  |
Term of amortized interest expense, years |  |  |  | 10 years | 10 years |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 5.80% |  |  |  |  |  |  |  |  |
Interest Rate Exchange Agreement Expiring 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  | $ 350,000 |  |
Interest rate contract settlement amount |  | $ 34,700 |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Exchange Agreement Settlement on February 28, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  | $ 350,000 |  |  |
Interest Rate Exchange Agreements Expiring 2011 and 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of interest expense |  |  |  | $ 37,900 |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 5.30% |  |  |  |  |  |  |  |
Settlement amount interest rate contract |  |  |  | 38,700 |  |  |  |  |  |  |  |  |  |
Interest rate settlement recognized as other expense |  |  |  | $ 800 |  |  |  |  |  |  |  |  |  |
Foreign currency exchange contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | € |  |  |  |  |  |  |  |  | € 180,000,000 |  |  |  |  |
Cash received from settlement of contracts |  |  | $ 6,600 |  |  |  |  |  |  |  |  |  |  |
Foreign currency exchange contracts | Other (Income) Expense Net |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on derivatives |  |  |  |  |  |  |  | $ 900 |  |  |  |  |  |

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