Hedging - Notional Amount (Details) - Foreign Currency Forward Contracts - Designated as Hedging Instruments - Cash Flow Hedging - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional amount of foreign currency forward contract	$ 966,601	$ 728,386
Euro
Derivative [Line Items]
Notional amount of foreign currency forward contract	632,621	501,197
British pound sterling
Derivative [Line Items]
Notional amount of foreign currency forward contract	166,707	87,032
Australian dollar
Derivative [Line Items]
Notional amount of foreign currency forward contract	92,524	89,705
Canadian dollar
Derivative [Line Items]
Notional amount of foreign currency forward contract	$ 74,749	$ 50,452