Fair Value Measurements and Derivative Instruments - Balance Sheet Hedging Instruments (Details) - Foreign currency debt - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	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