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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, 2020 | Dec. 31, 2019
Derivative Instruments |  |
Carrying value of non-derivative instrument designated as hedging instrument | $ 333,061 | $ 358,078
Current portion of debt |  |
Derivative Instruments |  |
Carrying value of non-derivative instrument designated as hedging instrument | 40,153 | 73,572
Long-term debt |  |
Derivative Instruments |  |
Carrying value of non-derivative instrument designated as hedging instrument | $ 292,908 | $ 284,506

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