Hedging - Notional Amount (Details) - Designated as hedging instruments - Cash Flow Hedging - Foreign currency forward contracts - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative, Notional Amount	$ 1,091,916	$ 728,386
Euro
Derivative [Line Items]
Derivative, Notional Amount	745,099	501,197
British pound sterling
Derivative [Line Items]
Derivative, Notional Amount	160,427	87,032
Australian dollar
Derivative [Line Items]
Derivative, Notional Amount	99,922	89,705
Canadian dollar
Derivative [Line Items]
Derivative, Notional Amount	$ 86,468	$ 50,452