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Fair Value Measurements and Derivative Instruments - Balance Sheet Hedging Instruments (Details) - Foreign currency debt - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Derivative Instruments |  |
Carrying value of non-derivative instrument designated as hedging instrument | $ 107,773 | $ 263,031
Current portion of debt |  |
Derivative Instruments |  |
Carrying value of non-derivative instrument designated as hedging instrument | 39,207 | 43,696
Long-term debt |  |
Derivative Instruments |  |
Carrying value of non-derivative instrument designated as hedging instrument | $ 68,566 | $ 219,335

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- Definition Nominal or face amount used to calculate payments on a nonderivative instrument. + References No definition available. + Details
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