Hedging - Notional Amount (Details) - Foreign currency forward contracts - Designated as hedging instruments - Cash flow hedging - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional amount of foreign currency forward contract	$ 826,957	$ 728,386
Euro
Derivative [Line Items]
Notional amount of foreign currency forward contract	581,764	501,197
British pound sterling
Derivative [Line Items]
Notional amount of foreign currency forward contract	124,160	87,032
Australian dollar
Derivative [Line Items]
Notional amount of foreign currency forward contract	74,643	89,705
Canadian dollar
Derivative [Line Items]
Notional amount of foreign currency forward contract	$ 46,390	$ 50,452