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Derivative instruments and hedging activities - Effect Of Derivative Instruments On Consolidated Statements Of Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Derivatives Designated As Hedging Instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in OCI on Derivative $ (74)   $ (598)  
Gain or (Loss) Recognized in OCI on Derivative   $ (1,480)   $ (268)
Gain or (Loss) Reclassified from Accumulated OCI into Income 1,239 2,516 2,809 4,310
Derivatives Designated As Hedging Instruments | Foreign Exchange Forward | Net Sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in OCI on Derivative (5,132)   5,724  
Gain or (Loss) Recognized in OCI on Derivative   (1,350)   450
Gain or (Loss) Reclassified from Accumulated OCI into Income 2,726 2,651 5,260 4,396
Derivatives Designated As Hedging Instruments | Foreign Exchange Forward | Cost of Sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in OCI on Derivative 2,962   (3,798)  
Gain or (Loss) Recognized in OCI on Derivative   (139)   (409)
Gain or (Loss) Reclassified from Accumulated OCI into Income (850) (61) (1,369) (41)
Derivatives Designated As Hedging Instruments | Foreign Exchange Forward | Operating Expenses        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in OCI on Derivative 2,096   (2,524)  
Gain or (Loss) Recognized in OCI on Derivative   9   (309)
Gain or (Loss) Reclassified from Accumulated OCI into Income (637) (74) (1,082) (45)
Derivatives Not Designated As Hedging Instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in Income (193) (141) 105 (369)
Derivatives Not Designated As Hedging Instruments | Foreign Exchange Forward        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in Income $ (193) $ (141) $ 105 $ (369)