Derivatives and Hedging Activities - Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives not designated as hedging instruments, gain (loss)	$ (50,071)	$ 77,253	$ (30,154)	$ 97,015
Embedded derivatives | Revenues
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives not designated as hedging instruments, gain (loss)	(3,308)	2,830	1,402	3,552
Economic hedge of embedded derivatives | Revenues
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives not designated as hedging instruments, gain (loss)	3,259	(3,221)	(2,342)	(2,680)
Foreign currency forward contracts | Other income (expense)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives not designated as hedging instruments, gain (loss)	$ (50,022)	$ 77,644	$ (29,214)	$ 96,143