Derivative Instruments - Not Designated as Hedging Instruments by Classification and Amount of Gains and Losses (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
|
Derivative Instruments, Gain (Loss) [Line Items] | ||||
Amount of (Loss) Gain Recognized in the Statements of Operations | $ (2,317) | $ 13,633 | $ (19,429) | $ 65,093 |
Foreign currency forward exchange contracts | Other non-operating expense, net | ||||
Derivative Instruments, Gain (Loss) [Line Items] | ||||
Amount of (Loss) Gain Recognized in the Statements of Operations | (2,332) | 13,624 | (19,196) | 64,582 |
Foreign currency forward exchange contracts | Cost of sales | ||||
Derivative Instruments, Gain (Loss) [Line Items] | ||||
Amount of (Loss) Gain Recognized in the Statements of Operations | $ 15 | $ 9 | $ (233) | $ 511 |