Hedging - Notional Amount (Details) - Foreign currency forward contracts - Designated as hedging instruments - Cash flow hedging - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional amount of foreign currency forward contract	$ 931,198	$ 728,386
Euro
Derivative [Line Items]
Notional amount of foreign currency forward contract	633,770	501,197
British pound sterling
Derivative [Line Items]
Notional amount of foreign currency forward contract	150,407	87,032
Australian dollar
Derivative [Line Items]
Notional amount of foreign currency forward contract	89,443	89,705
Canadian dollar
Derivative [Line Items]
Notional amount of foreign currency forward contract	$ 57,578	$ 50,452